I'm trying to place a short story told from the viewpoint of a person who understands common idioms literally. For example, if someone asks him to “lend a hand”, he would understand that the hand needs to be detached from his body. I think a lot of the idioms were related to body parts. The story was carefully ambiguous as to whether he was disconnected from reality or the universe was an sf-nal one where the idioms came true. The character was aware of the strangeness.
I read the story a few years ago in a collection or anthology, and I have no reason to believe it was new then. For some reason I think it may be by Sturgeon, but I can't find it my Sturgeon collection, so that's probably a false impression.