Verb fall in has 3 senses
  1. collapse, fall in, cave in, give, give way, break, founder - 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"
    --1 is one way to change
    Sample sentences:
    Something ----s
    Somebody ----s
  2. fall in - to take one's place in a military formation or line; "Troops fall in!"
    Sample sentence:
    Somebody ----s
  3. join, fall in, get together - become part of; become a member of a group or organization; "He joined the Communist Party as a young man"
    Sample sentence:
    Somebody ----s PP
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