[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.