1. 松（弛）的　not pulled tight; loose; relaxed
2. 清淡的，不活跃的　not busy; inactive; sluggish
3. 懈怠的，马虎的　dull; idle; neglectful

　He tightened a few slack screws.　他旋紧了几只松动的螺丝。
　Winter is the slack season at most hotels.　对大多数旅馆来说，冬天是淡季。
　Discipline in Mr. Brow's class becomes very slack.　布朗先生班上的纪律很松。
　Security's got a bit slack.　安全问题有些放松。
　Living alone, he became slack about his appearance.　由于单独过活，他对自己的外表越来越不在意了。
　Don't get slack at your work.　不要疏忽你的工作。
　He is always slack in doing his homework.　他做作业总是马马虎虎。
　Nancy is slack in answering letters.　南希很少回信。

1. vt. & vi.懈怠；偷懒　 be lazy or careless in one's work
2. vt. & vi.减速；放松　 reduce speed, effort, tightness, etc.

　～ one's pace　放慢脚步
　～ one's vigilance　放松警惕
　～ carelessly　粗心地放松
　～ dreadfully　极端放松
　～ habitually　习惯性地偷懒
　～ inconsiderately　粗心地放松
　～ inexcusably　不可原谅地懈怠
　～ inherently　本质性地偷懒
　～ naturally　自然地放松
　～ negligently　粗心地放松
　～ thoughtlessly　毫不考虑地放松
　～ uncommonly　不寻常地放松
　～ unpardonably　不可原谅地懈怠
　～ utterly　完全地放松
　～ weakly　无力地放松
　～ down　滞销
　～ off　放松，懈怠
　～ up　（使）减速；（使）松劲
　～ on　在…方面松散〔懈怠〕
　～ one's pace to a walk　把步速放慢到步行速度

　Stop slacking and get on with digging.　不要偷懒，继续挖。
　His pace has gradually slacked.　他的步速逐渐慢了下来。
　The breeze slacked.　风变小了。
　Slack the rope before trying to untie the knot.　想解结之前先将绳索放松。

 ♣ slack down　(v.+adv.)
　滞销　become unsalable
　Retail business slacks down when employment drops.　就业率低时零售业就不景气。
 ♣ slack off　(v.+adv.)
1. 放松（绳索等） loosen (sth such as a rope)
　Slack off those ropes there, there's a storm coming!　把那里的绳索放松，风暴就要来了！
2. 松懈；懈怠 become lazy or inactive
　It's natural to slack off towards the end of a hard day's work.　辛苦工作了一天，快结束时有所松弛是很自然的。
　Haas slacked off in his work.　哈斯工作很懈怠。
　Don't slack off in your studies.　不要荒废你的学业。
3. 滞销 become unsalable
　House sales in this city usually slack off during our severe winters.　在严寒的冬季，这座城市的房产通常销路不好。
　Business usually slacks off at this time of the year.　每年这个时候生意一般都很清淡。
 ♣ slack on　(v.+prep.)
　在…方面松散〔懈怠〕　become inactive on (sth)
　The instructors were slacking on the job.　教员们对工作松松垮垮。
 ♣ slack up　(v.+adv.)
　（使）减速；（使）松劲　(cause to) reduce speed or effect
　Slack up before you reach the cross roads.　到交叉路口以前减速。
　The doctor advised Facer to slack up for few days, as his lifestyle was having a bad effect on his heart.　医生劝告费塞放松几天，因为他的生活方式对他的心脏产生了不良影响。
　Slack up the tent ropes before it rains.　在下雨之前把帐篷的绳子放松。
　Please slack up your speed, I can't run as fast as you!　请你跑慢点！我跑得没你快。

　［同义词］ adj. baggy, dull, easy, loose, quiet, slow
　［反义词］ adj. busy, diligent, quick, rigid, stiff
　［词源］古英语slæc（松弛）