flat out
US /flæt aʊt/
UK /flæt aʊt/
1.
as fast or as hard as possible
:
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He worked flat out to finish the project on time.
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The car was going flat out down the highway.
2.
directly and clearly; without hesitation or reservation
:
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She told him flat out that she wasn't interested.
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He denied the accusation flat out.