Dictionary › F › fall in
fall in
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Quick answer
As a verb, fall in means break down, literally or metaphorically.
Meanings of fall in
3 meaningsverb
To take one's place in a military formation or line
“Troops fall in!”
Become part of; become a member of a group or organization
“He joined the Communist Party as a young man”
Similar: join, get together
Meanings from Wiktionary (CC BY-SA 4.0) and Open English WordNet (CC BY 4.0).