SLUMPS

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.

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.