1. 1.

not taut or held tightly in position; loose.

"a slack rope"

synonyms: loose, limp, not taut, not tight, hanging, flapping;
  1. 2.

having or showing laziness or negligence.

"slack accounting procedures"

synonyms: lax, negligent, neglectful, remiss, careless, slapdash, slipshod, lackadaisical, lazy, inefficient, incompetent, inattentive, offhand, casual, disorderly, disorganized;


  1. 1.

the part of a rope or line which is not held taut; the loose or unused part.

"I picked up the rod and wound in the slack"

synonyms: looseness, play, give

"the rope had just enough slack in it to allow her to reach him"

  1. 2.

casual trousers.

"he put on a grey shirt and loose cotton slacks"


  1. 1.

loosen (something, especially a rope).

"slacking the outhaul allows you to adjust the sail"

  1. 2.

decrease or reduce in intensity, quantity, or speed.

"the flow of blood slacked off"

synonyms: reduce, lessen, slacken, slow, ease up/off 
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