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tr.v. un·round·ed, un·round·ing, un·rounds
To pronounce (a sound) with the lips in a flattened or neutral position.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


not round
vb (tr)
(Linguistics) to release (lips) from a rounded position, esp in pronunciation
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014



1. to articulate (an ordinarily rounded vowel) without rounding the lips.
2. to extend (the lips) laterally in a spread or neutral position.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
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Unrounding the comers of collaborative family health care.
For example, the first element of the GOAT vowel has undergone fronting and unrounding over the last several decades.
--(U): The fronting, unrounding, and lowering of /u/ in the FOOT lexical set: 'good' [[??]d], 'books' [b[??]ks].
Further east, where a clear(er) /u/ - /[??]/ split exists, there has been greater progress in the fronting and unrounding.
The less frequent occurrence of o in several dialects is linked to the change of o into u in non-initial syllables, and in the Eastern dialect, to the unrounding of the o in the first syllable, i.e.
Do the differences in the spread of o point to a more general tendency of rounding in the western dialects of Estonian and unrounding in the eastern dialects?
As an example of unrounding is the change o > o in the Eastern dialects, as in e.g.
64-78): NHG diphthongization and monophthongization (the latter idiosyncratically called 'Mitteldeutsche Monophthongierung'), lowering of high vowels, quantity changes, rounding, unrounding, and contraction.
Various accounts of the significance of such alternation suggest definable contexts for unrounding of /y(:)/ and rounding of /i(:)/.
Forward-shifting of /uw/ and /ow/ is also true of the Southern shift, except that in all three cases it is not so much a matter of shifting as of unrounding of the first element of the diphthong, with the Southerners having gone furthest.
The centralizing of /uw/ and /ow/ are really simply unrounding of the first segment of the diphthong, thereby spreading the distance between the starting point and the finishing point, i.e.
This tendency toward unrounding is so strong in American English that one variety of American English, now probably the majority variety, from the Plains through the Rockies and the West Coast, close to a "standard" pronunciation followed by more speakers than any other variety in the English-speaking world, simply has no round vowels at all.