What does "fall in" mean?

Take one's place in formation or in the ranks, as in The sergeant ordered the troops to fall in. A related expression is fall into, as in They all fell into their places. [Early 1600s] Also see fall into.
Sink inward, cave in, as in The snow was so heavy that we feared the roof would fall in. [Early 1700s] Also see under drop in; the subsequent idioms beginning with fall in; fall into.

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