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general::
Phrase(s): in deep water
Fig. in a dangerous or vulnerable situation; in a serious situation, especially one that is too difficult or is beyond the level of one’s abilities; in trouble. • John is having trouble with back taxes. He’s in deep water. • Bill got in deep water in algebra class. The class is too difficult for him, and he’s almost failing.
McGrawhill's American Idioms And Phrasal Verbs