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Phrase(s): trail behind (someone or something)
1. to follow or drag along behind someone or something. • A long satin train trailed behind the bride. • A long train trailed behind. 2. to move along behind someone or a group in a competition. • Sally trailed behind the rest of the marathon runners. • Roger trailed behind Dave during most of the race.
McGrawhill's American Idioms And Phrasal Verbs