slacken

放松、松开、变松

He slackened the rope so the boat could drift a little.

他把绳子放松，让船可以稍微漂移。

放慢、减缓

The train slackened its speed as it approached the station.

火车接近车站时放慢了速度。

减弱、减退

Demand for new houses has slackened in recent months.

近几个月来新屋的需求已经减弱。

松懈、懈怠

We must not slacken our efforts in the final week.

最后一周我们绝不能松懈努力。

减弱、放慢、趋缓

The rain finally slackened off around midnight.

雨势到了半夜终于减弱。