crash1
  
  v.
     - collide violently with an obstacle or another vehicle. 
▸(of an aircraft) fall from the sky and violently hit the land or sea.
 ▸informal (of a company's shares) fall suddenly and disastrously in value.
 ▸Computing  fail suddenly.
 - move with force, speed, and sudden loud noise. 
▸make a sudden loud, deep noise.
 - 
(also crash out)
 informal fall deeply asleep.
 - informal gatecrash (a party).
 - chiefly N. Amer. (of a patient) suffer a cardiac arrest.
 
n.
  - an instance of crashing.
 - a sudden loud, discordant noise.
 
adj.
 done rapidly and involving a concentrated effort:
 a crash course in Italian.
 
  Etymology
  ME: imitative, perh. partly suggested by craze and dash.
 
  
    
crash2
  
  n.
 dated a coarse plain linen, woollen, or cotton fabric.
 
  Etymology
  C19: from Russ. krashenina ‘dyed coarse linen’.