v.使松弛；使缓慢；变弱
We're on the last lap, so don't slacken! 我们已处最後阶段，可不要松劲啊！
The bonds of traditional family life began to slacken. 传统的家庭生活的纽带开始松弛。
There is no reason to believe that this pace will slacken. 没有理由使人们相信这个速度会变慢。
The train slackened speed as we approached the station. 当我们快到车站时，火车减慢了速度。
The demand for coal begins to slacken off in the spring. 煤的需求在春天开始减少。
