flop into

flop into something

[for someone] to fall or drop into something, such as bed, a chair, a bathtub, etc. Maggie flopped into the chair and slipped off her shoes. Tom flopped into bed and fell fast asleep.
See also: flop
References in classic literature ?
He stooped, and dipped his beak in the pond; he thought it was his beak, but, of course, it was only his nose, and, therefore, very little water came up, and that not so refreshing as usual, so next he tried a puddle, and he fell flop into it.