W: (v) crash [Related to: crash] (undergo a sudden and severe downturn) "the economy crashed"; "will the stock market crash again?"
W: (v) collapse [Related to: collapse] (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"
W: (v) collapse [Related to: collapse] (lose significance, effectiveness, or value) "The school system is collapsing"; "The stock market collapsed"
S: (n) crash, smash (the act of colliding with something) "his crash through the window"; "the fullback's smash into the defensive line"
S: (n) crash ((computer science) an event that causes a computer system to become inoperative) "the crash occurred during a thunderstorm and the system has been down ever since"
Verb
S: (v) crash (fall or come down violently) "The branch crashed down on my car"; "The plane crashed in the sea"
S: (v) crash (move with, or as if with, a crashing noise) "The car crashed through the glass door"
S: (v) crash, ram (undergo damage or destruction on impact) "the plane crashed into the ocean"; "The car crashed into the lamp post"
S: (v) crash (move violently as through a barrier) "The terrorists crashed the gate"