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English definition of “fall in”

fall in

(SOLDIERS) phrasal verb with fall     /fɔːl/ US  /fɑːl/ verb (fell, fallen)
If soldiers fall in, they move into a line, one at the side of the other: "Company, fall in!" shouted the sergeant-major. He started to march away, and the others fell in behind him. → Compare fall outMilitary training and ceremonies
(Definition of fall in (SOLDIERS) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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