flop

/flɒp/ verb [I] (present participle flopping, past tense and past participle flopped)

Definition

flop down/into/onto, etc › to fall or sit somewhere suddenly in a heavy or relaxed way: He flopped down on the sofa.

HANG › to hang loosely: Her hair kept flopping in her eyes.

NOT SUCCESSFUL informal › If a film, product, plan, etc flops, it is not successful.

(Definition of flop verb from the Cambridge Learner's Dictionary © Cambridge University Press)

to do something that spoils someone's plans

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