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Highly dubious or suspicious; seeming to not be aboveboard. I don't know if you should sign that contract, it seems a bit fishy to me. Don't you think it's a little fishy how eager he is to be in charge of the accounts?
fishy about the gills
Hung-over. A: "How are you feeling after your night of partying?" B: "Ugh, fishy about the gills—I've been throwing up all morning!"
to seem suspicious. Barlowe squinted a bit. Something smells fishy here, he thought. something about the deal smelled fishy—too good to be true.
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]
mod. dubious; questionable; likely to be improper or illegal. (see also smell fishy.) That was a pretty fishy story you told us.
in. to seem suspicious. (see also fishy.) Marlowe squinted a bit. Something smells fishy here, he thought.