slackens
v.
（使）松弛( slacken的第三人称单数 );
（使某物）放慢;
松懈下来;
变迟缓;
例句:
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Work slackens on a hot day.
热天工作缓慢.
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If the demand for one product slackens, another line of business can provide balance.
如果一种产品的需求量减少, 另一种产品可代替它,使营业保持平衡.
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If an artist slackens the pace, he will be beaten by his rivals.
假如一位艺术家放慢步伐, 和他竞争的人就要把他打倒.
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Her face slackens and she turns back to the TV.
来自NEWYORKER
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But here the bounding pace of "We, the Drowned" slackens.
来自WSJ
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The quietly vengeful The King Has Lost His Crown slackens the pace a little but retains the slick funkiness.
来自BBC