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English definition of “fall in”

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fall in

verb uk phrasal verb with fall   /fɔːl/ us    /fɑːl/ (fell, fallen)

(ROOF)

If a roof or ceiling falls in, it drops to the ground because it is damaged: Ten miners were trapped underground when the roof of the tunnel fell in.

(SOLDIERS)

If soldiers fall in, they form a line or move in a line, one behind the other: "Company, fall in!" shouted the sergeant-major. He started to march away, and the others fell in behind him.
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(Definition of fall in from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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