| 6 Afro-Asiatic | 6.2.2.1.6 Classical Arabic to Cypriot Arabic | uː iː → oː eː / _ʕ
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| uː iː → oː eː / ʕ_
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| uː iː → u i
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| 6.2.2.1.14 Classical Arabic to Moroccan Arabic | aː iː uː → ɑː eː oː / near emphatics
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| 6.2.2.1.16 Classical Arabic to Sudanese Arabic | u(ː) → {ɵ,o}(ː)
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| 6.2.2.1.18 Proto-Semitic to Biblical Hebrew | — i iː u uː → eə iːə oə uːə / _R
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| — {o,u}(ː) → iː / _$%oː
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| 14 Elamo-Dravidian | 14.3.1 Standard Tamil to Colloquial Tamil | aː eː iː oː uː → a ɛ i o u / _#
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| 17 Indo-European | 17.1.1 Proto-Indo-European to Gheg Albanian | eː iː oː uː → o i e {y,i}
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| 17.1.2 Proto-Indo-European to Tosk Albanian | eː iː oː uː → o i e {y,i}
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| 17.3.1 Proto-Indo-European to Artsakh Armenian | {e,i}ː {u,o}ː → i u
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| 17.3.2 Proto-Indo-European to Erevan Armenian | {e,i}ː {u,o}ː → i u
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| 17.3.3 Proto-Indo-European to Istanbul Armenian | {e,i}ː {u,o}ː → i u
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| 17.3.4 Proto-Indo-European to Kharpert Armenian | {e,i}ː {u,o}ː → i u
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| 17.3.5 Proto-Indo-European to Sebastia Armenian | {e,i}ː {u,o}ː → i u
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| 17.3.6 Proto-Indo-European to Southeast Armenian | {e,i}ː {u,o}ː → i u
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| 17.3.7 Proto-Indo-European to Southwest Armenian | {e,i}ː {u,o}ː → i u
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| 17.5.2 Proto-Celtic to Middle Welsh | uː {oi,ɔː} → yː uː
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| 17.7.2.1.6 Early Modern English to Australian English | ɜːɹ ɑːɹ ɔːɹ eːɹ oːɹ iːɹ uːɹ → ɜː ɑː ɔː ɛə ɔə ɪə ʊə / syllable-finally
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| uː → ʊə → uː / _ɫ ! in Queensland and New South Wales
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| uː → ʊʉ → ʉː / else
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| 17.7.2.1.7 Early Modern English to British English | ɜːɹ ɑːɹ ɔːɹ eːɹ oːɹ iːɹ uːɹ → ɜː ɑː ɔː ɛə ɔə ɪə ʊə / syllable-finally
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| 17.7.2.1.9 Early Northern Middle English to Scots | — uː → ʌu / when-stem final, in northern varieties
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| — iː eː ɛː aː oː uː {øː,yː} → əi i {i,e} e o u ø
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| 17.7.2.1.10 Old English to Scots | uː → u
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| 17.7.2.2 West Germanic to Old Low Franconian | uː → ʉw / _V (probably, in most areas)
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| uː → ʊw / _V (probably, in areas that did not undergo the above change, such as Limburg)
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| uː → ʉː (probably, in areas with uː → ʉw / _V)
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| 17.7.2.2.1 Old Low Franconian to Middle Dutch | uː → yː
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| {uː,uw} u → ɔw o (except in the southeast)
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| 17.7.2.2.2 Middle Dutch to Modern Dutch | uː → ʌu (? conjectured based on the above diphthongization and on developments in Polder Dutch vowels)
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| 17.7.2.3 Middle High German to Standard German | uː yː iː → ou øy ei, except in certain unstressed endings and monosyllables, _C{C,V,#} (“especially before /xt/”), and Low German borrowings
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| 17.7.3 Common Germanic to Proto-Norse | (w)u(ː) i(ː) → (w)o(ː) e(ː) / _(C)(C)a ! CC = NC or one C = {ʀ,j}
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| {æ,e}ːuː {æ,e}ːiː → eu ai
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| w{o,u}ːwuː j{e,i}ːjiː → uː iː
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| 17.7.3.1 Proto-Norse to Old Norse | u {o,ɒ} a au juː → y ø æ y yː / _(C)(C)(C)j
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| {(j)u,we}ː {o,ɒ}ː aː au → yː øː æː æy
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| u {o,ɒ} a au juː → y ø æ æy yː / _(C)(C)(C)i
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| {u,we,wi} {o,ɒ} a au juː → y ø æ æy yː / _(C)(C)(C)i
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| u {o,ɒ} a au juː → y ø æ æy yː / _(C)(C)(C)j
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| u {o,ɒ} a au juː → y ø æ æy yː / #(C)(C)_ʀ
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| Eː{u,o}ː Eːaː → joː jaː / {v,w}_
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| 17.7.3.1.2 Old Norse to Orkney Norn | uː → øː / _CC
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| 17.7.3.1.3 Old Norse to Shetland Norn | {u,o}(ː) a aː {ɒ,œ,y} e i(ː) → {o,ɔ}(i) æ(i) {ɔ,ɒ}(i) {o,ɔ}(i) {æ,e} / _{Ḱ,Cʲ}
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| uː → {u,o,ɒ,ø} (conditioning unclear; it seems the presence of a velar consonant may have helped to retain the quality of /u/)
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| {ɒ,ey} j{u,o,a}ː yː → o ø u / Ḱ_
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| j{u,o,a}ː → ø
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| 17.8.2 Proto-Indo-European to Attic Greek | u(ː)(j) → y(ː)(j)
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| 17.8.8 Proto-Indo-European to Ionic Greek | u(ː)(j) → y(ː)(j)
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| 17.9 Proto-Indo-European to Hittite | {uː,eu,au} → u
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| 17.11 Proto-Indo-European to Proto-Slavic | iː uː → i ɨ
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| {e(ː),i(ː)} {a(ː),o(ː),u(ː)} → ẽ õ / _N$
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| 17.11.1 Proto-Slavic to Polish | iː uː ɨː → i u ɨ
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| 17.12.1.1.1 Classical Latin vs. Vulgar Latin | uː → u
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| “In contrast, Romanian exhibits u, uː → u (and ultimately also ɔ, oː → o); and Sardinian and African Latin underwent a straight merger of the vowels by length without considering quality (e, eː → e; i, iː → i; u, uː → u; etc.)”
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| 17.12.1.1.2 Latin to Catalan | uː → u / stressed
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| uː → u / _%”V
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| {u(ː),o(ː)} → ∅ / _#
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| 17.12.1.1.3 Latin to French | — uː → u
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| — u(ː) → o / except _V (?)
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| 17.12.1.1.5 Latin to Portuguese | uː → u
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| {u(ː),o(ː)} → o → u / _#
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| 17.12.1.1.7 Vulgar Latin to Rhaeto-Romance | uː → y (→ i in most descendants, with the exception of Engadine)
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| 17.12.1.1.8 Latin to Romanian | — iː o(ː) u(ː) → i o u
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| — {o(ː),uː} → o
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| 17.13 Proto-Indo-European to Proto-Tocharian | uh1 u{h2,h3} → uː → wə wɨ
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| 33 Penutian | 33.3.1 Proto-Yokuts to General Yokuts | iː ɨː uː → eː əː oː (this change sometimes did not occur)
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| 37 Siouan-Iroquoian | 37.1.2 Proto-Iroquoian to Proto-Northern Iroquoian | o(ː) u(ː) → a(ː) o(ː)
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| 46 Vowel Shifts | 46.5 Old English-to-Scots Vowel Shifts | uː → ʌu / when-stem final, in northern varieties
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| iː eː ɛː aː oː uː {øː,yː} → əi i {i,e} e o u ø
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| 46.7 Great Vowel Shift (English) | iː uː → əj əw → ɑj ɑw
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| 46.8 Greek Vowel Shift | u(ː) → y(ː)
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| 46.13 Old Norse to Faroese Vowel Shift | uː → ʉu / ʏ
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| 46.14 Pre-Slavic Vowel Changes | uː → ɨ
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