relax 
英 [rɪˈlæks]  美 [rɪˈlæks] 
v. （使）轻松；放宽；松懈；宽慰；缓和

例句：
As the drug took effect his muscles slowly relaxed. 

随着药力发挥作用，他的肌肉慢慢松弛了下来。

His face relaxes into a contented smile. 

他的脸放松下来，露出一个满意的微笑。

Do something that you know relaxes you. 

做点你知道会让你放松的事情。

Soft music helps to relax the mind. 

轻柔的音乐有助于放松身心。

He gradually relaxed his grip. 

他抓紧的手慢慢松开了。