slump

intransitive verb

To fall or sink heavily; collapse.

intransitive verb

To droop, as in sitting or standing; slouch.

intransitive verb

To decline suddenly; fall off.

intransitive verb

To perform poorly or inadequately.

intransitive verb

To sink or settle, as into mud or slush.

intransitive verb

To slide down or spread out thickly, as mud or fresh concrete.

noun

The act or an instance of slumping.

noun

A drooping or slouching posture.