unscrew
/ˌʌnˈskruː/verb
1- (with reference to a lid or other object held in place by a spiral thread) unfasten or be unfastened by twisting旋松卸下; 把（瓶等螺纹盖）旋开：
with obj. Will unscrewed the cap from a metal flask威尔旋下了金属瓶盖子
no obj. the spout usually unscrews or lifts off easily.这喷嘴通常容易旋开或掀掉。
1.1
- with obj. detach, open, or slacken (something) by removing or loosening the screws holding it in place（旋去或旋松螺丝以）拆卸, 打开、拧松。