smell a rat
察觉到可疑的事情或发现不寻常的迹象
口语·表达怀疑
英文释义
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.
典故来源
源自16世纪英国，猫通过气味察觉老鼠存在，比喻察觉可疑迹象。