1 [no object] (of a vehicle) collide violently with an obstacle or another vehicle:a racing car had crashed, wrecking a safety barrierthe stolen car she was riding in crashed into a tree
[with object] cause (a vehicle) to collide violently with something:they crashed a lorry through a fence
(of an aircraft) fall from the sky and hit the land or sea:a jet crashed 200 yards from the school
[with object] cause (an aircraft) to fall from the sky:the test pilot crashed a Hurricane fighter plane
2move or cause to move with force, speed, and sudden loud noise: [no object, with adverbial of direction]:huge waves crashed down on to us [with object and adverbial of direction]:she crashed down the telephone receiver
[no object] make a sudden loud noise:the thunder crashed
3 [no object] informal (of shares, a business, etc.) suddenly drop in value or fail:the shares crashed to 329p
be heavily defeated in a sporting competition:Barcelona crashed out of the European Cup
4 [no object] (of a computer, computing system, or software) fail suddenly:the project was postponed because the computer crashed
chiefly North American (of a patient) suffer a cardiac arrest.
5 [with object] informal enter (a party) without an invitation; gatecrash.
illegally pass (a red traffic light):the cab driver crashed the lights
6 [no object] informal go to sleep, especially suddenly or in an improvised setting:what was it you said just before I crashed out?
1a violent collision, typically of one vehicle with another or with an object:a car crash
an instance of an aircraft falling from the sky to hit the land or sea:a pilot who survived the crash of his plane
2a sudden loud noise as of something breaking or hitting another object:he slammed the phone down with a crash
3a sudden disastrous drop in the value or price of something:the 1987 stock-market crash
the sudden failure of a business:the crash of the company meant that 150 jobs would go
4a sudden failure which puts a computer system out of action:system crashes are an everyday hazard
done rapidly or urgently and involving a concentrated effort:a crash course in Italian
with a sudden loud sound:crash went the bolt
crash and burn
informal come to grief or fail spectacularly:I’ve seen guests crash and burn on the show
late Middle English: imitative, perhaps partly suggested by craze and dash