<p><strong>Verb</strong></p><ul><li>(used without object) to make a loud, clattering noise, as of something dashed to pieces.</li><li>to break or fall to pieces with noise.</li><li>(of moving vehicles, objects, etc.) to collide, especially violently and noisily.</li><li>to move or go with a crash; strike with a crash.</li><li>Aeronautics. to land in an abnormal manner, usually causing severe damage: The airliner crashed.</li><li>to collapse or fail suddenly, as a financial enterprise: The stock market crashed.</li><li>Informal. to gain admittance to a party, performance, etc., without an invitation, ticket, or permission.</li><li>Slang. to sleep.</li><li>to have a temporary place to sleep or live without payment: He let me crash at his house.</li><li>to fall asleep: I get home in the evening and I just crash till it's time for dinner.</li><li>Slang. to experience unpleasant sensations, as sudden exhaustion or depression, when a drug, especially an amphetamine, wears off.</li><li>Medicine/Medical Slang. to suffer cardiac arrest.</li><li>Ecology. (of a population) to decline rapidly.</li><li>Computers. to shut down because of a malfunction of hardware or software.</li></ul><p><strong>Noun</strong></p><ul><li>a sudden loud noise, as of something being violently smashed or struck: the crash of thunder.</li><li>a breaking or falling to pieces with loud noise: the sudden crash of dishes.</li><li>a collision or crashing, as of automobiles, trains, etc.</li><li>the shock of collision and breaking.</li><li>a sudden and violent falling to ruin.</li><li>Synonyms: ruin, failure.</li><li>a sudden general collapse of a business enterprise, prosperity, the stock market, etc.: the crash of 1929.</li><li>Aeronautics. an act or instance of crashing.</li><li>Ecology. a sudden, rapid decline in the size of a population.</li></ul><p><strong>Adjective</strong></p><ul><li>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.</li></ul><p><strong>End of Response</strong></p>