smell something fishy
觉得可疑，觉得有问题
口语·表达直觉怀疑
英文释义
to suspect that something is not right or seems suspicious
例句
The deal seemed too easy; I smelled something fishy right away.
典故来源
源自鱼市腐败气味，比喻事物可疑或不正当，19世纪起流行。