Verb
make slack as by lessening tension or firmness

Verb
become looser or slack; "the rope slackened"

Verb
become slow or slower; "Production slowed"

Verb
make less active or fast; "He slackened his pace as he got tired"; "Don''t relax your efforts now"

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

a.
To be remiss or backward; to be negligent.

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

a.
To abate; to become less violent.

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

a.
To languish; to fail; to flag.

a.
To end; to cease; to desist; to slake.

v. t.
To render slack; to make less tense or firm; as, to slack a rope; to slacken a bandage.

v. t.
To neglect; to be remiss in.

v. t.
To deprive of cohesion by combining chemically with water; to slake; as, to slack lime.

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

v. t.
To cause to become less intense; to mitigate; to abate; to ease.

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

Slacken

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