Question 1

What does "fall in" mean?

Accepted Answer

Of a structure such as a roof or ceiling: to collapse inward.

Question 2

How do you use "fall in" in a sentence?

Accepted Answer

Years of neglect had weakened the barn roof, and it finally fell in after the heavy snowfall.

Question 3

Is "fall in" formal or informal?

Accepted Answer

"fall in" is register-neutral — appropriate in both casual and formal contexts. In military contexts, 'fall in!' is a direct order for soldiers to form ranks. In structural contexts, it describes a roof or surface collapsing inward. Both uses are clear from context. The military sense is well known even among civilians from films and TV.

fall in

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