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Phrase(s): able to fog a mirror
Fig. Inf. alive, even if just barely. (Usually jocular. Alludes to the use of a small mirror placed under the nose to tell if a person is breathing or not. (Able to can be replaced with can.) • Look, I don’t need an athlete to do this job! Anybody able to fog a mirror will do fine!
McGrawhill's American Idioms And Phrasal Verbs