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Phrase(s): on the wrong track
1. Lit. [of a train] following the wrong set of tracks. • We had to back up, because somehow we got on the wrong track. 2. Fig. going the wrong way; following the wrong set of assumptions. • You’ll never get the right answer. You’re on the wrong track. • They won’t get it figured out because they are on the wrong track.
McGrawhill's American Idioms And Phrasal Verbs