What is the meaning of the idiom 'smell a rat'

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In each of the questions, four alternatives are given for the Idiom/Phrase. Choose the alternative which best expresses the meaning of the Idiom/Phraseand click the button corresponding to it. Smell a rat
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To Smell the rat ( Choose the one which best express the meaning of the given idiom)
Choose the one which best expresses the meaning of the given IDIOM : to smell a rat
Choose the one which best expresses the meaning of the given idiom : To smell a rat.
What is the meaning of the idiom ‘smell a rat’?
Which is the meaning of the idiom- 'smell a rat'?
What is the meaning of the idiom 'smell a rat'?