fall in Definition in the Cambridge English Dictionary
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Definition of “fall in” - English Dictionary

Definition of "fall in" - British English Dictionary

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fall in

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

fall in (ROOF)

If a ​roof or ​ceilingfalls in, it ​drops to the ​ground because it is ​damaged: Ten ​miners were ​trappedunderground when the ​roof of the ​tunnelfell in.

fall in (SOLDIERS)

If ​soldiersfall 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 ​othersfell 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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