[verb] 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" Synonyms:collapse, cave in, give, give way, break, founder
[verb] to take one's place in a military formation or line; "Troops fall in!"
[verb] become part of; become a member of a group or organization; "He joined the Communist Party as a young man" Synonyms:join, get together
