UNROUND
not round. in later use specifically (in phonetics): not enunciated with the lips rounded.
to make (something) no longer round. in later use specifically (in phonetics): to reduce or eliminate the rounding of the lips when enunciating (a sound, especially a vowel).
to make (something) no longer round. in later use specifically (in phonetics): to reduce or eliminate the rounding of the lips when enunciating (a sound, especially a vowel).