slacken off

v. 放松, 松弛, 减弱

例句与用法：

The rope holding the tree in place was slackened off as the tree was now well rooted.

由于树木现在已经牢牢扎根，拉扯树木的绳索松下来了。

词形变化：

动词过去式: slackened | 动词过去分词: slackened | 动词现在分词: slackening | 动词第三人称单数: slackens |