foul play
noun [ U ] uk/ˌfaʊl ˈpleɪ/ us/ˌfaʊl ˈpleɪ/
(CRIME)
暴行;（尤指）谋杀
a criminal act that results in serious damage or injury, especially murder
It is not clear what caused the explosion, but the police do not suspect foul play. 还不清楚是什么引起了爆炸，但警方没有怀疑是谋杀。
(SPORT)
犯规行为;犯规动作
in sport, the act of playing unfairly or doing something that is against the rules