unscrew
verb [ T ] uk/ʌnˈskruː/ us/ʌnˈskruː/
(LID)
拧下…的盖子;把…顶部拧开
to take the lid or top off something by twisting it round
I can't unscrew the top of this jar - it's really tight. 这个瓶盖我拧不下来——实在太紧了。
(SCREWS)
（拧下螺丝以）取下，卸下
to remove something by taking the screws out of it