
1) Abate 2) Become looser or slack 3) Become slow or slower 4) Ease 5) Have more play 6) Let up 7) Make less active or fast 8) Slack 9) Slow 10) Slow down 11) Slow up 12) Subside 13) To become slack 14) To slake 15) Weaken
Found on
https://www.crosswordclues.com/clue/slacken

1) Abate 2) Douse 3) Dowse 4) Ease 5) Ease off 6) Ease up 7) Ebb 8) Letup 9) Relax 10) Untie
Found on
https://www.crosswordclues.com/clue/slacken

• (v. t.) To cause to become less intense; to mitigate; to abate; to ease. • (a.) To be remiss or backward; to be negligent. • (a.) To languish; to fail; to flag. • (a.) To lose rapidity; to become more slow; as, a current of water slackens. • (v. t.) To render slack; to make less tense or firm; as, to slack a rope; to slac...
Found on
http://thinkexist.com/dictionary/meaning/slacken/

1. To become slack; to be made less tense, firm, or rigid; to decrease in tension; as, a wet cord slackens in dry weather. ... 2. To be remiss or backward; to be negligent. ... 3. To lose cohesion or solidity by a chemical combination with water; to slake; as, lime slacks. ... 4. To abate; to become less violent. 'Whence these raging fires Will sla...
Found on
http://www.encyclo.co.uk/local/20973
Slack'en noun (Metal.) A spongy, semivitrifled substance which miners or smelters mix with the ores of metals to prevent their fusion. [ Written also
slakin .]
Found on
http://www.encyclo.co.uk/webster/S/117

[
v] - become looser or slack 2. [v] - make slack as by lessening tension or firmness
Found on
http://www.webdictionary.co.uk/definition.php?query=slacken
verb make slack as by lessening tension or firmness
Found on
https://www.encyclo.co.uk/local/20974
No exact match found.