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foul play
Foul Play Suspected was created in 1935.
Foul, meaning:
1. Disgusting, vile
2. "Foul!" at a football match (bad play or something not allowed.)
foul as in; foul smell: nauseabond, infect, sale
foul as in; foul play: jeu deloyal (malveillance)
Foul play is like something done roughly not gently