pick a hole in
pick a hole in or pick holes in {v. phr.}, {informal}
To find a mistake in or things wrong with; criticize; blame.
The witness said he had been walking in the moonlight last Sunday, but the lawyer picked a hole in what he said by proving that there was no moon and that it rained Sunday night.
Mary is always picking holes in what the other girls do.
Compare: FIND FAULT.
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Source: A Dictionary of American Idioms