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fall in

v.
1.(房屋等)坍下，倒塌
2.【军】集合
3.同意
4.(债务等)到期

同：	[v.] collapse, founder, get together, join

动词解释：

break down, literally or metaphorically
- The wall collapsed
- The business collapsed
- The dam broke
- The roof collapsed
- The wall gave in
- The roof finally gave under the weight of the ice
[同] collapse, fall in, founder, give, give way, break, cave in
to take one's place in a military formation or line
- Troops fall in!

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