Princeton's WordNet

1. slow, slow down, slow up, slack, slacken(verb)

   become slow or slower

   "Production slowed"

2. slack, slacken, slack up, relax(verb)

   make less active or fast

   "He slackened his pace as he got tired"; "Don't relax your efforts now"

3. slacken(verb)

   become looser or slack

   "the rope slackened"

4. slacken, remit(verb)

   make slack as by lessening tension or firmness

Wiktionary

1. slacken(Verb)

   To gradually decrease in intensity or tautness; to become slack.

   The pace slackened.

2. slacken(Verb)

   To make slack, less taut, or less intense.

Origin: * From slæcan

Webster Dictionary

1. Slacken(adj)

   to become slack; to be made less tense, firm, or rigid; to decrease in tension; as, a wet cord slackens in dry weather

2. Slacken(adj)

   to be remiss or backward; to be negligent

3. Slacken(adj)

   to lose cohesion or solidity by a chemical combination with water; to slake; as, lime slacks

4. Slacken(adj)

   to abate; to become less violent

5. Slacken(adj)

   to lose rapidity; to become more slow; as, a current of water slackens

6. Slacken(adj)

   to languish; to fail; to flag

7. Slacken(adj)

   to end; to cease; to desist; to slake

8. Slacken(verb)

   to render slack; to make less tense or firm; as, to slack a rope; to slacken a bandage

9. Slacken(verb)

   to neglect; to be remiss in

10. Slacken(verb)

    to deprive of cohesion by combining chemically with water; to slake; as, to slack lime

11. Slacken(verb)

    to cause to become less eager; to repress; to make slow or less rapid; to retard; as, to slacken pursuit; to slacken industry

12. Slacken(verb)

    to cause to become less intense; to mitigate; to abate; to ease

13. Slacken(noun)

    a spongy, semivitrifled substance which miners or smelters mix with the ores of metals to prevent their fusion

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