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1 [krash]
verb (used without object)
to make a loud, clattering noise, as of something dashed to pieces.
to break or fall to pieces with noise.
(of moving vehicles, objects, etc.) to collide, especially violently and noisily.
to move or go with a crash; strike with a crash.
Aeronautics. to land in an abnormal manner, usually causing severe damage: The airliner crashed.
to collapse or fail suddenly, as a financial enterprise: The stock market crashed.
Informal. to gain admittance to a party, performance, etc., without an invitation, ticket, or permission.
to sleep.
to have a temporary place to sleep or live without payment: He let me crash at his house.
to fall asleep: I get home in the evening and I just crash till it's time for dinner.
Slang. to experience unpleasant sensations, as sudden exhaustion or depression, when a drug, especially an amphetamine, wears off.
Medicine/Medical Slang. to suffer cardiac arrest.
Ecology. (of a population) to decline rapidly.
Computers. to shut down because of a malfunction of hardware or software.
verb (used with object)
to break into pieces violently and noisily; shatter.
to force or drive with violence and noise (usually followed by in, through, out, etc.).
Aeronautics. to cause (an aircraft) to make a landing in an abnormal manner, usually damaging or wrecking the aircraft.
to gain admittance to, even though uninvited: to crash a party.
to enter without a ticket, permission, etc.: to crash the gate at a football game.
a sudden loud noise, as of something being violently smashed or struck: the crash of thunder.
a breaking or falling to pieces with loud noise: the sudden crash of dishes.
a collision or crashing, as of automobiles, trains, etc.
the shock of collision and breaking.
a sudden and violent falling to ruin.
a sudden general collapse of a business enterprise, prosperity, the stock market, etc.: the crash of 1929.
Aeronautics. an act or instance of crashing.
Ecology. a sudden, rapid decline in the size of a population.
characterized by an intensive effort, especially to deal with an emergency, meet a deadline, etc.: a crash plan to house flood victims; a crash diet.

1350–1400; 1920–25 def. 16; 1870–75 for def 22; Middle English crasche, blend of crase to break (see craze) and masche mash

crasher, noun

13. smash. 21. failure, ruin.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
crash1 (kræʃ)
1.  to make or cause to make a loud noise as of solid objects smashing or clattering
2.  to fall or cause to fall with force, breaking in pieces with a loud noise as of solid objects smashing
3.  (intr) to break or smash in pieces with a loud noise
4.  (intr) to collapse or fail suddenly: this business is sure to crash
5.  to cause (an aircraft) to hit land or water violently resulting in severe damage or (of an aircraft) to hit land or water in this way
6.  to cause (a car, etc) to collide with another car or other object or (of two or more cars) to be involved in a collision
7.  to move or cause to move violently or noisily: to crash through a barrier
8.  informal (Brit) short for gate-crash
9.  (intr) (of a computer system or program) to fail suddenly and completely because of a malfunction
10.  slang (intr) another term for crash out
11.  informal crash and burn to fail; be unsuccessful
12.  an act or instance of breaking and falling to pieces
13.  a sudden loud noise: the crash of thunder
14.  a collision, as between vehicles
15.  a sudden descent of an aircraft as a result of which it hits land or water
16.  the sudden collapse of a business, stock exchange, etc, esp one causing further financial failure
17.  (modifier)
 a.  requiring or using intensive effort and all possible resources in order to accomplish something quickly: a crash programme
 b.  sudden or vigorous: a crash halt; a crash tackle
18.  informal crash-and-burn a complete failure
[C14: probably from crasen to smash, shatter + dasshen to strike violently, dash1; see craze]

crash2 (kræʃ)
a coarse cotton or linen cloth used for towelling, curtains, etc
[C19: from Russian krashenina coloured linen]

crashing (ˈkræʃɪŋ)
informal (prenominal) (intensifier) (esp in the phrase a crashing bore)

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

c.1400, crasschen "break in pieces," appeared 14c. with no identifiable ancestors or relatives, and is probably onomatopoeic. Sense of "financial collapse" is 1817, "collision" is 1910, "falling airplane" is W.W.I. Computing sense is 1973, which makes it one of the earliest computer jargon words. Meaning
"break into a party, etc." is 1922. Slang meaning "sleep" dates from 1943; especially from 1965.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Stop often to watch foamy waves crashing over the rocks and sea otters at play.
In summer, the crashing waves calm down to make the water welcoming for
  beginning bodysurfers.
There are crowded happenings, and the heat and hurry of situations crashing
  into their consequences.
The sky is always falling somewhere, and right now it's crashing down on the
  world of admissions.
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