collapse
This word carries a heavy sense of suddenness and total failure. It is not a gradual decline but a catastrophic break. When used for buildings, it evokes a violent, noisy descent. When used for people, it suggests a total loss of consciousness or strength, often implying a medical emergency or extreme fatigue. In a systemic sense, it describes a complete breakdown of order or economy where the internal support structures vanish. It is more final and dramatic than words like fail or decline, suggesting that the entity cannot simply be repaired but must be entirely rebuilt from the rubble.
Countable when referring to a specific event of falling, such as a building collapse. Uncountable when referring to the general state of failure, such as the collapse of civilization.
Meanings
To fall down suddenly because of a lack of strength, support, or structural integrity.
"The old warehouse collapsed during the earthquake."
To fall down suddenly from exhaustion, illness, or shock.
"The marathon runner collapsed just meters from the finish line."
To fold or fold up a structure so that it takes up less space.
"You can collapse the camping chair for easy transport."
To fail suddenly and completely, such as a system, economy, or negotiation.
"The peace talks collapsed after the latest round of disagreements."
A sudden fall of a building, bridge, or other structure.
"The collapse of the bridge caused massive traffic delays."