smell fishy
Be suspect or suspicious, as in His explanation definitely smells fishy; my guess is that he's lying. This idiom alludes to the fact that fresh fish have no odor but stale or rotten ones do. [Early 1800s]
Words nearby smell fishy
smeech,
smegma,
smegmalith,
smell,
smell a rat,
smell fishy,
smell to high heaven,
smell up,
smeller,
smellies,
smelling bottle