What does crash mean?
Crash functions as both noun and verb, describing violent collisions, abrupt failures, and sudden declines. As a noun, it most commonly denotes a vehicle accident or a sharp drop in financial markets; as a verb, it can mean colliding forcefully, ceasing to function (as with a computer program), or plummeting in value. Informal senses extend the word further: to 'crash' is to fall asleep suddenly, to stay briefly at someone's home without arrangement, or to attend an event uninvited ('gatecrashing'). The word carries connotations of violence, suddenness, and loss of control, making it vivid in journalism, finance, and everyday speech alike. Its versatility across registers — from technical documentation describing a server outage to casual talk of crashing on a friend's couch — makes it one of English's more adaptable words, equally at home describing physical impact and metaphorical collapse.
A violent collision involving a vehicle, aircraft, or other moving object; also a sudden loud noise of breaking or impact, or an abrupt failure or steep decline (as of a computer system or financial market).
"Investigators spent months piecing together the cause of the plane crash."
In British English, a car accident is often called simply a 'crash'; American English historically favored 'accident,' though 'crash' is now common there too.
To collide violently with something; to fail abruptly or cease functioning suddenly (said of machines, programs, markets, or businesses); or, informally, to sleep somewhere briefly, stay at someone's home uninvited, or enter an event without a ticket or invitation.
"Her laptop crashed right in the middle of the presentation."
Relating to or designed for rapid, intensive completion, as in a short-term intensive course or an emergency landing procedure.
"She took a crash course in Spanish before relocating to Madrid."
This adjectival use appears almost exclusively in fixed phrases like 'crash course' and 'crash landing.'
Standard plural form, used when referring to multiple instances of collisions, failures, or market declines.
"The report analyzed several crashes caused by brake failure."
The word 'crash' didn't exist before the 1600s — and it took another two centuries before anyone thought to use it for falling asleep uninvited on someone's sofa.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of crash
Crash entered English in the early 17th century, likely formed through a combination of existing words such as crack and clash, reflecting the onomatopoeic tradition of imitating harsh percussive sounds. Its earliest uses described loud breaking noises and violent impacts, senses it retains today. The financial sense emerged by the 19th century, notably applied to market collapses, while the computing sense developed in the mid-20th century alongside electronic systems. The informal sleeping sense appeared later still, extending the idea of sudden, unplanned collapse to human exhaustion.
Related word forms
How crash is actually used
In computing contexts, 'crash' is standard register despite its informal origins. The sense meaning 'to sleep over informally' is distinctly informal American English, though widely understood elsewhere. 'Crash into' implies movement toward something, distinguishing it from simple 'collide with' in some technical writing.
Easily confused with crash
'Cache' is a hidden store of data or goods, while 'crash' is a collision or abrupt failure — they sound unrelated but are occasionally confused in computing contexts like 'browser cache' versus 'browser crash'.
'Cash' means money in coin or notes, whereas 'crash' refers to a collision or sudden failure.