- to cease to function due to a sudden breakdown
Pyramid schemes tend to generate profits for a while and then collapse.
uncountable · collapse, collapsed, collapsed
- to become unstable or collapse, mentally or otherwise
I am afraid my computer will break down if I try to run it at too high a speed.
break down, broke, broken
- be emotionally in crisis
My old briefcase is falling apart. I'll have to buy a new one.
fall apart, fell, fallen
- (''intransitive'') to collapse inward or downward
The roof caved in under the weight of the snow.
cave in, cave ined, cave ined
- fall over
Next, fold the paper over, so the right half is on top of the left half.
fold, folded, folded
- to collapse heavily
Exhausted, he slumped down onto the sofa.
slump, slumped, slumped