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English definition of “slack”

slack

noun [U]     /slæk/
resources, such as money, people, or time, that are not being used at a particular time: At the moment we have very little slack for dealing with emergencies.slack in something Anne and Bill didn't have enough slack in their household budget.
pick/take up slack to make a business, industry, or economy operate more effectively by doing the work that someone else has stopped doing but that still needs to be done: More business investment would pick up the slack in the economy. The drug maker is having problems with production, but none of its competitors have taken up the slack.
slackness noun [U]
(Definition of slack noun from the Cambridge Business English Dictionary © Cambridge University Press)
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