fail completely to produce the intended or expected effect.
RELATED IDIOMS :
fall flat on your face
fall over forwards
fail in an embarrassingly obvious way
flat as a pancake
as fast or as hard as possible – informal
without hesitation or reservation
unequivocally - chiefly North American
1995 - Independent - Since August 1993 she has been working flat out on her latest three part documentary.
1993 - Coloradoan - She flat out said she didn't trust her fellow board members.
on the flat
on level ground as opposed to uphill
(of a horse race) on an open course as opposed to one with jumps
fall flat :
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