One of the mysteries of the English language finally explained.
Not round. In later use specifically (in Phonetics): not enunciated with the lips rounded.
with object 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).
Late 16th century; earliest use found in Cyprian Lucar (1544–?1611). From un- + round<br>early 17th century; earliest use found in Randle Cotgrave (fl. 1587–?1630), lexicographer. From un- + round, originally after French † desrondir.
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