the game is up idiom
事已败露;戏该收场
used to tell someone that you know what their secret activities or plans are and that these cannot continue
Okay, you two, the game's up! Give me the cigarettes - this time I'm telling your parents. 好了，你俩，狐狸尾巴露出来了！把烟给我——这回我可要告诉你们的父母了。