- to fall or cave in; crumble suddenly: The roof collapsed and buried the crowd.
- to be made so that sections or parts can be folded up, as for convenient storage: This bridge table collapses.
- to break down; come to nothing; fail: Despite all their efforts the peace talks collapsed.
- to fall unconscious or as if unconscious or physically depleted, as from a stroke, heart attack, disease, or exhaustion.
- Pathology.
- to sink into extreme weakness.
- (of lungs) to come into an airless state.
- to cause to collapse: He collapsed the table easily.
- a falling in or together: Three miners were trapped by the collapse of the tunnel roof.
- a sudden, complete failure; breakdown: The bribery scandal brought about the complete collapse of his industrial empire.
- to fall down or cave in suddenly
- to fail completely
- to break down or fall down from lack of strength
- to fold (furniture, etc) compactly or (of furniture, etc) to be designed to fold compactly
- the act or instance of suddenly falling down, caving in, or crumbling
- a sudden failure or breakdown