- Become looser - Loosen - To become slack; to be made less tense, firm, or rigid; to
decrease in tension; as, a wet cord slackens in dry weather. - To be remiss or backward; to be negligent. - To lose cohesion or solidity by a chemical combination
with water; to slake; as, lime slacks. - To abate; to become less violent. - To lose rapidity; to become more slow; as, a current of
water slackens.