slackening
v.
（使）松弛( slacken的现在分词 );
（使某物）放慢;
松懈下来;
变迟缓;
例句:
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Perceptible slackening of the taut muscles of his mouth.
来自M. Sinclair
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There was a slackening of western output during the 1930s.
20世纪30年代西部的产出有所减少。
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Wang replied without slackening his pace.
王三毛一边回答,一边只顾走.
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Indeed, its idea was slackening in New England by the early eighteeth century.
其实, 到了十八世纪初,控制新英格兰的这种思想已有所减弱.
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But as time went on she began to believe in her invention, and became terrified of any sign of slackening of effort.
来自NEWYORKER
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Dr. Nagaraj went vague, his face slackening, then, "Oh, yes," as he pretended to remember what he'd been saying.
来自NEWYORKER