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The definition of slack

13 Definitions of: slack

1. adjective, not tight, tense, or taut
2. adjective, negligent or careless
3. adjective, (esp of water, etc) moving slowly
4. adjective, (of trade, etc) not busy
5. adjective, phonetics. another term for lax
6. adverb, in a slack manner
7. noun, a part of a rope, etc, that is slack
8. noun, a period of decreased activity
9. noun, a) a patch of water without current b) a slackening of a current
10. noun, prosody (in sprung rhythm) the unstressed syllable or syllables
11. verb, to neglect (one's duty, etc)
12. verb, to loosen; to make slack
13. verb, chem. a less common word for slake, slacks
14. Show me some examples of this word: slack
15. Show me the etymology of the word: slack
1. noun, small pieces of coal with a high ash content
2. Show me some examples of this word: slack
3. Show me the etymology of the word: slack

Synonyms:	surplus, excess, overflow, leftover, glut, surfeit, superfluity, room, leeway, give (informal)	And more...
Antonyms:	taut, busy, strict

From Collins