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, fall in, cave in, give, give way, break, founder
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, fall in, get together
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