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:
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 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’.