fall in

verb

Definition of fall in 

intransitive verb

1 : to sink inward the roof fell in

2 : to take one's proper place in a military formation

fall in with

1 : to concur with had to fall in with her wishes

2 : to harmonize with it falls in exactly with my views

3 : to begin associating with she fell in with a bad crowd

First Known Use of fall in

1719, in the meaning defined at sense 1

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The first known use of fall in was in 1719

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