Noun

• S: (n) slack (slack%1:27:00::) (dust consisting of a mixture of small coal fragments and coal dust and dirt that sifts out when coal is passed over a sieve)
• S: (n) slump (slump%1:22:00::), slack (slack%1:22:00::), drop-off (drop-off%1:22:00::), falloff (falloff%1:22:00::), falling off (falling_off%1:22:00::) (a noticeable deterioration in performance or quality) "the team went into a slump"; "a gradual slack in output"; "a drop-off in attendance"; "a falloff in quality"
• S: (n) slack (slack%1:17:00::), slack water (slack_water%1:17:00::) (a stretch of water without current or movement) "suddenly they were in a slack and the water was motionless"
• S: (n) mire (mire%1:17:00::), quagmire (quagmire%1:17:00::), quag (quag%1:17:00::), morass (morass%1:17:00::), slack (slack%1:17:01::) (a soft wet area of low-lying land that sinks underfoot)
• S: (n) slack (slack%1:07:00::), slackness (slackness%1:07:00::) (the quality of being loose (not taut)) "he hadn't counted on the slackness of the rope"
• S: (n) slack (slack%1:06:00::) (a cord or rope or cable that is hanging loosely) "he took up the slack"

Verb

• S: (v) slack (slack%2:41:00::) (avoid responsibilities and work, be idle)
• S: (v) slack (slack%2:31:00::) (be inattentive to, or neglect) "He slacks his attention"
• S: (v) slack (slack%2:30:00::) (release tension on) "slack the rope"
• S: (v) slack (slack%2:30:03::), slacken (slacken%2:30:03::), slack up (slack_up%2:30:00::), relax (relax%2:30:05::) (make less active or fast) "He slackened his pace as he got tired"; "Don't relax your efforts now"
• S: (v) slow (slow%2:30:01::), slow down (slow_down%2:30:01::), slow up (slow_up%2:30:03::), slack (slack%2:30:05::), slacken (slacken%2:30:02::) (become slow or slower) "Production slowed"
• S: (v) slake (slake%2:30:00::), abate (abate%2:30:01::), slack (slack%2:30:04::) (make less active or intense)
• S: (v) abate (abate%2:30:00::), let up (let_up%2:30:00::), slack off (slack_off%2:30:01::), slack (slack%2:30:07::), die away (die_away%2:30:00::) (become less in amount or intensity) "The storm abated"; "The rain let up after a few hours"
• S: (v) slack (slack%2:30:06::), slake (slake%2:30:03::) (cause to heat and crumble by treatment with water) "slack lime"

Adjective

• S: (adj) loose (loose%3:00:00:lax:01), slack (slack%3:00:00:lax:01) (not tense or taut) "the old man's skin hung loose and grey"; "slack and wrinkled skin"; "slack sails"; "a slack rope"; "a slack grip"
• S: (adj) slack (slack%3:00:00:standing:02) (flowing with little speed as e.g. at the turning of the tide) "slack water"
• S: (adj) lax (lax%3:00:00:negligent:00), slack (slack%3:00:00:negligent:00) (lacking in rigor or strictness) "such lax and slipshod ways are no longer acceptable"; "lax in attending classes"; "slack in maintaining discipline"