1. A sound made when someone, or something, suddenly falls, lies, or sits down: The book fell to the floor with a flop.
2. Something that is a failure, a non-starter, a wash out: Despite the positive critical reviews, commercially the new play was a flop.

1. To sit, or to lie down heavily in a sudden, awkward way by relaxing the muscles and letting the body fall: He flopped down onto the couch while she flopped into the stuffed chair with a sigh.
2. To move limply, or heavily; to swing and to move in a loose, awkward, or uncontrolled way: The curtains were flopping around in the breeze which was coming through the open windows.
3. To fail completely; to be completely unsuccessful: The play flopped, or bombed, and all of their attempts to set things right also flopped miserably.

1. A dive in which the front of the body hits flat against a surface, especially of water: Celia did a belly flop into the swimming pool.
2. A shallow dive in which the front of the diver's body hits the water first: The children, supervised by the adults, were playing at the pool and did belly flops into the water, laughing hysterically all the time.

To execute a poorly done dive in which the front of the body lands flat on the surface of the water: Orville belly-flopped into the swimming pool right after his sister.

1. A type of loose rubber sandals: Fay wore flip-flops to the beach.
2. Sudden changes of opinions: The senator was accused of doing flip-flops on important social issues.

1. To undergo a complete turn around regarding a position or policy while trying to justify the change in the position: The presidential candidate kept flip-flopping on whether he would raise or lower income taxes.
2. Primarily in Britain, to undertake a "U" turn: The driver of the car ahead of Charles tried to flip-flop in a NO U-TURN zone and she was stopped by the police.