intransitive. To fall or throw oneself down suddenly; to flop. colloquial.

to flounce down; to flop down. to flounce over: to turn over abruptly.

To move clumsily or heavily; to move with a sudden bump or thud. Of a bird: To flap the wings heavily. Also with away, down, over, etc.

In extended use. intransitive. Often with on, on to, upon, etc. To throw oneself down suddenly on the stomach or face first; spec. (a) North American…