Question

slack 【slack】adj.懈怠的；疏忽的He was slack in fulfilling his promises and responsibilities.他对约定的事及其职责敷衍了事。

Accepted Answer

[slæk] 
slacknot tense or taut
If you slow down at the end of a race, you slack off. When you use slack this way, it means to reduce your speed, to be sluggish, or to be negligent.
If something is loose, it's also said to be slack. A clothesline, for example, is slack if it is just hanging loosely between two trees. If you pull the clothesline tight, you reduce the slack. The root word of slack is the Old English word slæc, which means loose or careless. When you scold your friend for being careless about his responsibilities, you can say, "Pick up the slack!"
All forms of 'slack' will appear on average once every 510 pages.slackslackenslackerslackingslacklyslacknessslacksslackening

Front	slack
Pron	[slæk]
Back	【slack】 adj.懈怠的；疏忽的 He was slack in fulfilling his promises and responsibilities. 他对约定的事及其职责敷衍了事。
Vocab	slacknot tense or taut If you slow down at the end of a race, you slack off. When you use slack this way, it means to reduce your speed, to be sluggish, or to be negligent. If something is loose, it's also said to be slack. A clothesline, for example, is slack if it is just hanging loosely between two trees. If you pull the clothesline tight, you reduce the slack. The root word of slack is the Old English word slæc, which means loose or careless. When you scold your friend for being careless about his responsibilities, you can say, "Pick up the slack!" All forms of 'slack' will appear on average once every 510 pages. slack slacken slacker slacking slackly slackness slacks slackening

Slack Means Reduce Word Slæk Adj.懈怠的；疏忽的 Fulfilling Promises