transitive verb1 a: to break violently and noisily :smashb: to damage (an airplane) in landing 2 a: to cause to make a loud noise <crash the cymbals together>b: to force (as one's way) through with loud crashing noises 3: to enter or attend without invitation or without paying <crash the party> 4: to move toward aggressively (as in fighting for a rebound) <basketball players crashing the boards> 5: to cause (a computer system, component, or program) to crashintransitive verb1 a: to break or go to pieces with or as if with violence and noise b: to fall, land, or hit with destructive force c: to decline suddenly and steeply dof a computer system, component, or program: to suffer a sudden major failure usually with attendant loss of data 2: to make a smashing noise <thunder crashing overhead> 3: to move or force one's way with or as if with a crash <crashes into the room> 4slang: to experience the aftereffects (as lethargy or depression) of a usually prolonged episode of drug use (as of amphetamines) 5slang: to go to bed or fall asleep; also: to reside temporarily :stay<crashing with friends for a few days>