A crashing sound

clatter, clash, bang; see noise 1.

A collision

wreck, accident, crackup; see collision 1.

To fall with a crash

overturn, upset, break down, plunge, be hurled, pitch, topple, smash, dive, hurtle, plummet, land violently, lurch, sprawl, tumble, fall headlong, fall flat, drop, slip, collapse, precipitate oneself, come a cropper*, spin in*; see also fall 1.

To break into pieces

shatter, smash, splinter, dash to pieces; see break 2, smash.

To make a crashing sound

clatter, bang, smash; see sound 1.

To have a collision

collide with, hit, strike, run together, run into, smash into, bump into, bang into, slam into, dash into, jostle, impact, bump, rear-end, sideswipe, butt, knock, punch, jar, jolt, go aground, hurtle into, crack up*, total*; see also hit 1, 2.

To break down

malfunction, shut down, fail; see break down 3.

*To sleep

go to bed, bed down, stay over, bunk*; see dwell, lodge 2, sleep.

*To go uninvited

invade, intrude, crash the gate*; see interrupt 2, meddle 1. See syn. study at break.