1 action that is against the rules of a sport; unfair or illegal dealings （运动中的）犯规行为; 不正当的或违法的交易: fresh evidence of foul play in financial dealings 在财务方面违法的新证据.
用法: 2 criminal violence that leads to murder （导致谋杀的）犯罪暴力行为: The police suspect foul play rather than suicide. 警方怀疑是谋杀不是自杀.