The fire in the office was not just an accident. I smell a rat.
Tripura Public Service Commission - 2019,
Answer: D
To smell a rat means to suspect some foul play.
The idiom comes from a dog or cat that smells a rat it cannot see: it senses that something hidden is wrong. In the sentence the speaker suspects that the fire was not an accident but deliberate.
'Detect a bad smell' is the literal reading the idiom is built to trap. 'To misunderstand something' and 'to ignore' are unrelated; the idiom is about growing suspicion, not confusion or indifference.
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