slackens , slackening , slackened
If something slackens or if you slacken it, it becomes slower, less active, or less intense.
Inflationary pressures continued to slacken last month.
通货膨胀的压力上个月持续减轻。
If your grip or a part of your body slackens or if you slacken your grip, it becomes looser or more relaxed.
Her grip slackened on Arnold's arm.
她紧拽着阿诺德的手松开了。