a serious accident in which one or more cars, trucks, or other vehicles hit something, or in which an aircraft hits the ground or another aircraft:

a loud noise that sounds as if it is caused by something violently breaking apart or hitting something else:

a sudden loss of value of investments, or a failure of a business

[ T ] infml to go to a party or other event without an invitation:

[ I ] slang to sleep, or to stay at a place to sleep temporarily:

[ always + adv/prep ] to fall or hit something in a noisy or violent way:

[ always + adv/prep ] To crash is also to move in a noisy or violent way:

[ I ] (of investments) to lose value, or (of a business) to lose money and be unable to continue to operate:

[ I ] If a computer crashes, it suddenly stops operating.

[ I/T ] (of a vehicle on the ground) to hit another vehicle or a large object violently, or (of an aircraft) to fall and violently hit the ground, a building, etc., or hit another aircraft while flying:

involving great effort to achieve a lot quickly:

A crash diet is a way of losing body weight quickly by eating very little.

ECONOMICS a sudden serious fall in the value of something, for example, of shares or of a particular area of business:

IT a sudden failure of a computer or system:

[ I ] ECONOMICS, FINANCE to suddenly lose value, in a way that is serious:

[ I or T ] IT if a computer or system crashes, or if someone or something crashes it, it suddenly stops working: