slack [slæk]

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adj.松弛的，萧条的，懈怠的；vt.使松弛

not tight ; loose

Slack off those ropes there, there's a storm coming? 把那里的绳索放松，暴风雨就要来了？
Some are hard at work and some are slack in work. 有的勤奋工作，有的则消极怠工。