Close back compressed vowel Close back rounded vowel









some languages, such japanese , swedish, have close vowel has distinct type of rounding, called compressed or exolabial. shanghainese known contrast more typical protruded (endolabial) close vowel, height of both vowels varies close close-mid.


there no dedicated diacritic compression in ipa. however, compression of lips can shown letter ⟨β̞⟩ ⟨ɯ͡β̞⟩ (simultaneous [ɯ] , labial compression) or ⟨ɯᵝ⟩ ([ɯ] modified labial compression). spread-lip diacritic ⟨  ͍ ⟩ may used rounded vowel letter ⟨u͍⟩ ad hoc symbol, spread technically means unrounded.


features

its vowel height close, known high, means tongue positioned close possible roof of mouth without creating constriction classified consonant.
its vowel backness back, means tongue positioned far possible in mouth without creating constriction classified consonant. unrounded vowels tend centralized, means in fact near-back.
its roundedness compressed, means margins of lips tense , drawn in such way inner surfaces not exposed.

occurrence







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