definition of
slack

[1] #1 slack s. [loose] not tense or taut; "the old man's skin hung loose and grey"; "slack and wrinkled skin"; "slack sails"; "a slack rope". wn

[2] #2 slack v. avoid responsibilities and work, be idle. wn

[3] #3 slack n. dust consisting of a mixture of small coal fragments and coal dust and dirt that sifts out when coal is passed over a sieve. wn

[4] #4 slack s. flowing with little speed as e.g. at the turning of the tide; "slack water". wn

[5] #5 slack n. [slump, 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". wn