verb (used with object)
to draw or loosen a screw from (a hinge, bracket, etc.).
to unfasten or withdraw by turning, as a screw or lid.
to open (a jar, bottle, etc.) by turning the lid or cover.
verb (used without object)
to permit of being unscrewed.

1595–1605; un-2 + screw

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
unscrew (ʌnˈskruː)
1.  (tr) to draw or remove a screw from (an object)
2.  (tr) to loosen (a screw, lid, etc) by rotating continuously, usually in an anticlockwise direction
3.  (intr) (esp of an engaged threaded part) to become loosened or separated: the lid wouldn't unscrew

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Example sentences
Unscrew the valve from the scuba tank with a wrench.
Unscrew it with a coin and you can replace with a bigger grip, or none at all.
Position a catch tub under the oil pan and unscrew the drain plug.
Unscrew a light bulb that uses a lot of electricity and replace it with one
  that uses much less.
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