| noun | dust consisting of a mixture of small coal fragments and coal dust and dirt that sifts out when coal is passed over a sieve |
| noun | a noticeable deterioration in performance or quality “the team went into a slump” |
| noun | a stretch of water without current or movement “suddenly they were in a slack and the water was motionless” |
| noun | a soft wet area of low-lying land that sinks underfoot |
| noun | the quality of being loose (not taut) “he hadn't counted on the slackness of the rope” |
| noun | a cord or rope or cable that is hanging loosely “he took up the slack” |
| verb | avoid responsibilities and work, be idle |
| verb | be inattentive to, or neglect “He slacks his attention” |
| verb | release tension on “slack the rope” |
| verb | make less active or fast “He slackened his pace as he got tired” |
| verb | become slow or slower “Production slowed” |
| verb | make less active or intense |
| verb | become less in amount or intensity “The storm abated” |
| verb | cause to heat and crumble by treatment with water “slack lime” |
| adjective | not tense or taut “the old man's skin hung loose and grey” |
| adjective | flowing with little speed as e.g. at the turning of the tide “slack water” |
| adjective | lacking in rigor or strictness “such lax and slipshod ways are no longer acceptable” |
| slack | verb | cause to heat and crumble by treatment with water |
| slump | verb | fall heavily or suddenly; decline markedly |
| drop off | verb | get worse |
| fall off | verb | fall heavily or suddenly; decline markedly |
| slack | adjective | flowing with little speed as e.g. at the turning of the tide |
| miry | adjective | (of soil) soft and watery |
| mire | verb | soil with mud, muck, or mire |
| quaggy | adjective | (of soil) soft and watery |
| slacker | noun | a person who shirks his work or duty (especially one who tries to evade military service in wartime) |
| slacking | noun | the evasion of work or duty |
| slack | noun | a cord or rope or cable that is hanging loosely |
| relaxation | noun | an occurrence of control or strength weakening |
| slowing | noun | a decrease in rate of change |
| slowdown | noun | the act of slowing down or falling behind |
| abatable | adjective | capable of being abated |
| abator | noun | a person who abates a nuisance |
| abatement | noun | an interruption in the intensity or amount of something |
| letup | noun | a pause during which things are calm or activities are diminished |
| looseness | noun | movement or space for movement |
| slackness | noun | the quality of being loose (not taut) |
| laxness | noun | the quality of being lax and neglectful |
| laxity | noun | the quality of being lax and neglectful |