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Phrase(s): a case of the blind leading the blind
Fig. a situation where people who don’t know how to do something try to teach other people. • Tom doesn’t know anything about cars, but he’s trying to teach Sally how to change the oil. It’s a case of the blind leading the blind. • When I tried to show Mary how to use a computer, it was a case of the blind leading the blind.
McGrawhill's American Idioms And Phrasal Verbs