Webster's English Dictionary

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flop

1. flop \'fla:p\ vb or flopped;  or flop.ping [alter. of 2flap] 1: to swing 
   or bounce loosely  2: to throw or move oneself in a heavy clumsy, or 
   relaxed manner  3: to change suddenly  4: to go to bed  5: to fail 
   completely  : to move or drop heavily and noisily  - flop.per n
2. flop n 1: an act or sound of flopping  2: a complete failure : DUD 
3. flop av : RIGHT, SQUARELY {fell ~ on his face}