a loud resonant repeating noise

a serious accident (usually involving one or more vehicles)

a sudden large decline of business or the prices of stocks (especially one that causes additional failures)

the act of colliding with something

(computer science) an event that causes a computer system to become inoperative

fall or come down violently

move with, or as if with, a crashing noise

undergo damage or destruction on impact

move violently as through a barrier

break violently or noisily; smash

occupy, usually uninvited

make a sudden loud sound

enter uninvited; informal

cause to crash

hurl or thrust violently

undergo a sudden and severe downturn

stop operating

sleep in a convenient place

a strong protective barrier that is erected around a racetrack or in the middle of a dual-lane highway in order to reduce the likelihood of severe accidents

a rapid and intense course of training or research (usually undertaken in an emergency)

a rapid descent by a submarine

a padded helmet worn by people riding bicycles or motorcycles; protects the head in case of accidents

make an emergency landing

an emergency landing under circumstances where a normal landing is impossible (usually damaging the aircraft)

a rapid and intense course of training or research (usually undertaken in an emergency)

a rapid and intense course of training or research (usually undertaken in an emergency)

descend steeply and rapidly

someone who gets in (to a party) without an invitation or without paying

informal intensifiers