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Phrase(s): beyond one’s depth
1. Lit. in water that is too deep. • Sally swam out from the beach until she was beyond her depth. • Jane swam out to get her even though it was beyond her depth, too. 2. Fig. beyond one’s understanding or capabilities. • I’m beyond my depth in calculus class. • Poor John was involved in a problem that was really beyond his depth.
McGrawhill's American Idioms And Phrasal Verbs