English definition of “flop”
/flɒp/ verb [I] (present participle flopping, past tense and past participle flopped)
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.