From Longman Dictionary of Contemporary Englishslackslack1 /slæk/ adjective1LOOSEhanging loosely, or not pulledtight opp tautKeep the rope slack until I tell you to pull it.2BUSY/HAVE A LOT TO DOwith less business activity than usual syn slowBusiness remained slack throughout the day.3CARELESSnot taking enough care or making enough effort to do things correctly – used to show disapproval syn carelessSlack defending by Real Madrid allowed Manchester United to score. —slackly adverb —slackness noun [uncountable]
slack• She called me into her office and accused me of slacking and taking too many holidays!• The horseslacked his pace, swung his neck down to ease the tension in it, and relaxed his tail.• It did not slack in the least until Centreville was reached.• I guess I thought that since everything was starting to turn around, I could slack off a little.• A lifetime of low-levelemployment is a high price to pay for slacking off in junior high.• Antonio Ramos, a mariachi since he turned 12, has seen the work for mariachis slack off too.• This is no time to be slacking off!• But Le Carré's not slacking off.• "You start tomorrow at nine, " he told them, "and no slacking, or there'll be trouble."From Longman Business Dictionaryslackslack1 /slæk/ adjective1COMMERCEa slackperiod of time is one with less business activity than usualBusiness is slack just now.The workers feared being laid off (=losing their jobs) in slack periods.2if someone is being slack, they are not taking enough care or making enough effort to do things rightThe report criticized airport security as “disgracefully slack”.High prices and the absence of competition may make firms slack in their use of resources. —slackness noun [uncountable]the slackness of the London market at presentThe report accuses the government of slackness.slackslack2 (also slack off) verb [intransitive]to make less of an effort than usual or be lazy in your workHe was accused of slacking and taking too many holidays.→ See Verb tableslackslack3 noun [uncountable]money, space, or people that an organization is not using at present, but could use in the futureThere is very little slack in the training budget for this year.