Fall Flat bare infinitive verb
This idiom is often used to refer to failed jokes or attempts at humor but also applies to ideas, suggestions, movements, events, stories or any efforts to convince.
Without him the party would have fallen flat.
She was badly disappointed when her performance fell flat.
I tried to convince my parents to reunite, but it fell flat.
To quit; to give up, stop doing something because you know that you cannot succeed; admit defeat
The key element of funny speech and writing is shortness.
To begin to decline or deteriorate decline; to get worse very quickly
A joking phrase used when someone receives a small amount of money
Starting of the idiom is a verb, we need to conjugate tense for the verb.
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The idiom fall flat was used since the first half of the 1800’s. Fall flat is often supposed to be a shortened version of fall flat on one’s face. However, it is more likely a shorted version of an older idiom ‘to fall flat upon the ear.’ The original idiom probably alluded to music that failed to please and was extended generally to spoken ideas, jokes, etc.