foul play

The definition of foul play is a treacherous action, unfair play or play that breaks the rules of the game.

(noun)

  1. When a fire is caused by arson, this is an example of a situation when there is foul play.
  2. When someone tackles in football in a way that is against the rules, this is an example of foul play.

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See foul play in Webster's New World College Dictionary

  1. unfair play; action that breaks the rules of the game
  2. treacherous action or violence; esp., murder

See foul play in American Heritage Dictionary 4

noun
Unfair or treacherous action, especially when involving violence.

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