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Verb: fall in
  1. Break down, literally or metaphorically
    "The wall fell in";
    - collapse, cave in, give, give way, break, founder
     
  2. To take one's place in a military formation or line
    "Troops fall in!"
     
  3. Become part of; become a member of a group or organization
    "He fell in the Communist Party as a young man";
    - join, get together

Derived forms: falling in, fallen in, fell in, falls in

Type of: change