fall in

1. Break down, literally or metaphorically (synset 201993067)
   "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"
   is a type of: change - undergo a change; become different in essence; losing one's or its original nature
   subtypes:

   • go off, implode - burst inward
   • buckle, crumple - fold or collapse
   • flop - fall loosely
   • break - curl over and fall apart in surf or foam, of waves
   • sink, slide down, slump - fall or sink heavily
   same as: break, cave in, collapse, founder, give, give way
   verb group:

   • abandon, give up - stop maintaining or insisting on; of ideas or claims
   • burst, collapse - cause to burst
2. To take one's place in a military formation or line (synset 202439706)
   "Troops fall in!"
3. Become part of;
   Become a member of a group or organization (synset 202439823)
   "He joined the Communist Party as a young man"
   subtypes:

   • sign up - join a club, an activity, etc. with the intention to join or participate
   • band oneself, league together - attach oneself to a group
   • organise, organize, unionise, unionize - form or join a union
   • affiliate - join in an affiliation
   • rejoin - join again
   • infiltrate, penetrate - enter a group or organization in order to spy on the members
   • unify, unite - act in concert or unite in a common purpose or belief
   same as: get together, join

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