call someone's bluff
口语·表示揭穿虚张声势
例句
When he claimed he could run a marathon, she called his bluff and signed him up for one.
典故来源
源自扑克牌游戏，玩家虚张声势时，对手要求其亮牌以揭穿谎言，后泛指挑战虚假主张。