slump

A heavy or helpless collapse; a slouching or drooping posture; a period of poor activity or performance, especially an extended period.

A measure of the fluidity of freshly mixed concrete, based on how much the concrete formed in a standard slump cone sags when the cone is removed.

A boggy place.

The noise made by anything falling into a hole, or into a soft, miry place.

The gross amount; the mass; the lump.

To collapse heavily or helplessly.

“Exhausted, he slumped down onto the sofa.”

To decline or fall off in activity or performance.

“Real estate prices slumped during the recession.”

To slouch or droop.

To lump; to throw together messily.

To fall or sink suddenly through or in, when walking on a surface, as on thawing snow or ice, a bog, etc.

(slang) To cause to collapse; to hit hard; to render unsconscious; to kill.