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flat-out

[flat-out] /ˈflætˈaʊt/
adjective, Informal.
1.
moving or working at top speed or with maximum effort; all-out:
a flat-out effort by all contestants.
2.
downright; thoroughgoing:
Many of the paintings were flat-out forgeries.
Origin of flat-out
1925-1930
1925-30
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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flat-out

adjective
  1. Open and direct; unambiguous; plain: Bunuel resorts to flat-out assertions in the last scene/ This time a flat-out demand
  2. Total; unrestricted •The noun flat-out, ''a failure,'' is found by 1870; the following example is an unconscious redundancy: a husband who was a flat-out failure/ Despite its creep-show pretensions, much of it is flat-out dull

The Dictionary of American Slang, Fourth Edition by Barbara Ann Kipfer, PhD. and Robert L. Chapman, Ph.D.
Copyright (C) 2007 by HarperCollins Publishers.
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7
8
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