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slacken

verb [I or T] (LESS ACTIVE)
 
 
/ˈslæk.ən/

Definition

to (cause to) become slower or less active: He stooped to pick it up, without slackening his pace (= without walking more slowly). The pace of trading slackened during the winter months. The management expects demand to slacken (off) in the New Year. The car's speed slackened (off) as it went up a steep hill. Most people slacken off/up at the end of a day's work.Increasing and decreasing speed of motion
(Definition of slacken verb (LESS ACTIVE) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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