smell a rat
察覺到可疑的事情或發現不尋常的跡象
口語·表達懷疑
英文釋義
to suspect that something is wrong or suspicious
例句
When he offered me a deal too good to be true, I smelled a rat.
典故來源
源自16世紀英國，貓通過氣味察覺老鼠存在，比喻察覺可疑跡象。