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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 of being improper, untoward, or duplicitous. A: "Their numbers don't match up with the taxes they've paid." B: "Hmm, something smells fishy." He thought Janet's response seemed a bit fishy, so he did a bit of investigation into her role in the company.
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.
smell fishy, to
To be suspect. This term, which refers to the fact that fresh fish do not smell but stale or rotten ones do, has been around since the early nineteenth century. J. G. Holland explained it explicitly (Everyday Topics, 1876): “Fish is good, but fishy is always bad.” The metaphor turns up in James Payn’s Confidential Agent (1880): “His French is very fishy.”
See also: smell