n.

1. a loud resonant repeating noise;
   clang, clangor, clangour, clangoring, clank, clash
   
   • he could hear the clang of distant bells
2. a serious accident (usually involving one or more vehicles);
   wreck
   
   • they are still investigating the crash of the TWA plane
3. a sudden large decline of business or the prices of stocks (especially one that causes additional failures);
   collapse
4. the act of colliding with something;
   smash
   
   • his crash through the window
   • the fullback's smash into the defensive line
5. (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

v.

1. fall or come down violently
   
   • The branch crashed down on my car
   • The plane crashed in the sea
2. move with, or as if with, a crashing noise
   
   • The car crashed through the glass door
3. undergo damage or destruction on impact;
   ram
   
   • the plane crashed into the ocean
   • The car crashed into the lamp post
4. move violently as through a barrier
   
   • The terrorists crashed the gate
5. break violently or noisily; smash;;
   break up, break apart
6. occupy, usually uninvited
   
   • My son's friends crashed our house last weekend
7. enter uninvited; informal;
   barge in, gate-crash
   
   • let's crash the party!
8. cause to crash
   
   • The terrorists crashed the car into the gate of the palace
9. hurl or thrust violently;
   dash
   
   • He dashed the plate against the wall
   • Waves were dashing against the rock
10. undergo a sudden and severe downturn
    
    • the economy crashed
    • will the stock market crash again?
11. stop operating;
    go down
    
    • My computer crashed last night
    • The system goes down at least once a week
12. sleep in a convenient place;
    doss, doss down
    
    • You can crash here, though it's not very comfortable