'slack' in a sentence

: not tense or taut

: flowing with little speed as e.g. at the turning of the tide

: lacking in rigor or strictness

: dust consisting of a mixture of small coal fragments and coal dust and dirt that sifts out when coal is passed over a sieve

: a noticeable deterioration in performance or quality

: a stretch of water without current or movement

: a soft wet area of low-lying land that sinks underfoot

: the quality of being loose (not taut)

: a cord or rope or cable that is hanging loosely

: avoid responsibilities and work, be idle

: be inattentive to, or neglect

: release tension on

: make less active or fast

: become slow or slower

: make less active or intense

: become less in amount or intensity

: cause to heat and crumble by treatment with water