Definition
To suspect that something is wrong or dishonest; to sense deception or foul play.
察覺事有蹊蹺，感覺其中有詐。
When I found a sum of money missing from my bank account, I started to smell a rat.
當我發現銀行帳戶裡少了一筆錢時，我開始察覺到事情不對勁。
This contract looks too good to be true; I'm beginning to smell a rat.
這份合約看起來好得不像是真的；我開始覺得其中有詐。
She suddenly changed her story, and I began to smell a rat.
她突然改變了說法，我開始覺得事情有蹊蹺。