"slack" in the noun sense
dust consisting of a mixture of small coal fragments and coal dust and dirt that sifts out when coal is passed over a sieve
2. slump, slack, drop-off, falloff, falling off
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"
3. slack, slack water
a stretch of water without current or movement
"suddenly they were in a slack and the water was motionless"
4. mire, quagmire, quag, morass, slack
a soft wet area of low-lying land that sinks underfoot
5. slack, slackness
the quality of being loose (not taut
"he hadn't counted on the slackness of the rope"
a cord or rope or cable that is hanging loosely
"he took up the slack"
"slack" in the verb sense
avoid responsibilities and work, be idle
be inattentive to, or neglect
"He slacks his attention"
release tension on
"slack the rope"
4. slack, slacken, slack up, relax
make less active or fast
"He slackened his pace as he got tired"
"Don't relax your efforts now"
5. slow, slow down, slow up, slack, slacken
become slow or slower
6. slake, abate, slack
make less active or intense
7. abate, let up, slack off, slack, die away
become less in amount or intensity
"The storm abated"
"The rain let up after a few hours"
8. slack, slake
cause to heat and crumble by treatment with water
"slack" in the adjective sense
1. loose, slack
not tense or taut
"the old man's skin hung loose and grey"
"slack and wrinkled skin"
"a slack rope"
"a slack grip"
flowing with little speed as e.g. at the turning of the tide
3. lax, slack
lacking in rigor or strictness
"such lax and slipshod ways are no longer acceptable"
"lax in attending classes"
"slack in maintaining discipline"
Source: WordNet® (An amazing lexical database of English)
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