Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • transitive v. To pronounce (a sound) with the lips in a flattened or neutral position.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • v. To change (a vowel) so that it is no longer round.

Etymologies

un- +‎ round (Wiktionary)

Examples

Comments

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