SLACK

(noun) a cord or rope or cable that is hanging loosely
"he took up the slack"
(noun) the quality of being loose (not taut)
"he hadn't counted on the slackness of the rope"
synonyms : slackness
(noun) a soft wet area of low-lying land that sinks underfoot
synonyms : mire , morass , quag , quagmire
Her feet were gradually sinking into the quagmire. -added by naila_inlas
(noun) a stretch of water without current or movement
"suddenly they were in a slack and the water was motionless"
synonyms : slack water
(noun) 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"
synonyms : drop-off , falling off , falloff , slump
(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
(verb) cause to heat and crumble by treatment with water
"slack lime"
synonyms : slake
(verb) become less in amount or intensity
"The storm abated", "The rain let up after a few hours"
synonyms : abate , die away , let up , slack off
Rather than leaving immediately, we waited for the storm to abate. -added by editor1

-tagged by Administrator

We are waiting for the rain to abate.
(verb) make less active or intense
synonyms : abate , slake
(verb) become slow or slower
"Production slowed"
synonyms : slacken , slow , slow down , slow up
(verb) make less active or fast
"He slackened his pace as he got tired", "Don't relax your efforts now"
synonyms : relax , slack up , slacken
(verb) release tension on
"slack the rope"
(verb) be inattentive to, or neglect
"He slacks his attention"
(verb) avoid responsibilities and work, be idle
(adj.) lacking in rigor or strictness
"such lax and slipshod ways are no longer acceptable", "lax in attending classes", "slack in maintaining discipline"
synonyms : lax
(adj.) flowing with little speed as e.g. at the turning of the tide
"slack water"
(adj.) not tense or taut
"the old man's skin hung loose and grey", "slack and wrinkled skin", "slack sails", "a slack rope"
synonyms : loose