Learn how to say Unscrew correctly in English with this tutorial pronunciation video.
Oxford dictionary definition of the word unscrew:
(with reference to a lid or other object held in place by a spiral thread) unfasten or be unfastened by twisting:
Will unscrewed the cap from a metal flask
the spout usually unscrews or lifts off easily
[with object] detach, open, or slacken (something) by removing or loosening the screws holding it in place:
he unscrewed the number plates from his old Renault