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Definition of flat-out adjective from the Oxford Advanced Learner's Dictionary

flat-out

adjective

/ˌflæt ˈaʊt/

/ˌflæt ˈaʊt/

[only before noun] (especially North American English)

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definite and direct; complete
- His story was full of contradictions and flat-out lies.
Oxford Collocations Dictionary
Flat-out is used with these nouns:
lie
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See flat-out in the Oxford Advanced American Dictionary

Check pronunciation: flat-out

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