· 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"
Synonym(s): collapse, cave_in, give, give_way, break, founder
Hypernym(s): change
· to take one's place in a military formation or line; "Troops fall in!"
· become part of; become a member of a group or organization; "He joined the Communist Party as a young man"
Synonym(s): join, get_together