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/ʌn'skruː/
to take the lid or top off something by twisting it round
拧下…的盖子;把…顶部拧开
If you unscrew something such as a lid, or if it unscrews, you keep turning it until you can remove it.
如果你unscrew盖子之类的东西，或者如果它unscrew了，那么就是说你不停地转动它，直到你能把它拿下来。
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。