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Phrase(s): drop behind (someone or something)
1. Lit. to reduce speed and end up after someone or a group, at the back of a moving line. • I dropped behind the rest of the people, because I can’t walk that fast. • I dropped behind the speeding pack of cars and drove a little slower. 2. Fig. to fail to keep up with the schedule being followed by someone or a group. • My production output dropped behind what it should have been. • I stayed later at work to keep from dropping behind.
McGrawhill's American Idioms And Phrasal Verbs