Quick definitions from WordNet (crash)

▸ noun:  the act of colliding with something ("His crash through the window")
▸ noun:  a serious accident (usually involving one or more vehicles) ("They are still investigating the crash of the TWA plane")
▸ noun:  a sudden large decline of business or the prices of stocks (especially one that causes additional failures)
▸ noun:  (computer science) an event that causes a computer system to become inoperative ("The crash occurred during a thunderstorm and the system has been down ever since")
▸ noun:  a loud resonant repeating noise
▸ verb:  move with, or as if with, a crashing noise ("The car crashed through the glass door")
▸ verb:  occupy, usually uninvited ("My son's friends crashed our house last weekend")
▸ verb:  stop operating ("My computer crashed last night")
▸ verb:  undergo a sudden and severe downturn ("The economy crashed")
▸ verb:  hurl or thrust violently
▸ verb:  undergo damage or destruction on impact ("The plane crashed into the ocean")
▸ verb:  break violently or noisily; smash;
▸ verb:  cause to crash ("The terrorists crashed the car into the gate of the palace")
▸ verb:  fall or come down violently ("The branch crashed down on my car")
▸ verb:  move violently as through a barrier ("The terrorists crashed the gate")
▸ verb:  enter uninvited; informal ("Let's crash the party!")
▸ verb:  sleep in a convenient place ("You can crash here, though it's not very comfortable")

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▸ Also see crash