Longman Dictionary of Contemporary English homepage

Date: 1600-1700
Origin: FLAP2

flop

1 verb
     
flop1 past tense and past participle flopped, present participle flopping [intransitive]
1 [always + adverb/preposition] to sit or lie down in a relaxed way, by letting all your weight fall heavily onto a chair etc:
He flopped down onto the bed.
I got home and flopped in front of the TV.
2 [always + adverb/preposition] to hang or fall loosely, in an uncontrolled way:
His head flopped back pathetically.
3 informal if something such as a product, play, or idea flops, it is not successful because people do not like it

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