fall in

Verb

• become part of; become a member of a group or organization
  • He joined the Communist Party as a young man
    

• to take one's place in a military formation or line
  • Troops fall in!
    

• 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
    

Related words

• Synonyms: 
  join , get together , collapse , cave in , give , give way , break , founder