|1.||[ verb ] break down, literally or metaphorically|
|Synonyms:||collapse cave_in give give_way founder break|
"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 terms:||change flop buckle slump break implode abandon collapse cave_in|
|2.||[ verb ] (military) to take one's place in a military formation or line|
"Troops fall in!"
|3.||[ verb ] become part of; become a member of a group or organization|
"He joined the Communist Party as a young man"
|Related terms:||unite rejoin sign_up unionize infiltrate affiliate band_oneself affiliate joiner|