Flat Out Definition
flătout
adverb
In a direct manner; bluntly.
Told me the truth flat out.
American Heritage
At top speed.
Running flat out.
American Heritage
adjective
Thoroughgoing; out-and-out.
A flat-out promotional campaign; a flat-out deception.
American Heritage
At full speed, with maximum effort, etc.
Webster's New World
Absolute; thorough; definite.
Webster's New World
Alternative form of flat out.
Wiktionary
Other Word Forms of Flat Out
Noun
Singular:
flat out
Plural:
flat outs
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