un·screw

[uhn-skroo]
verb (used with object)
1.
to draw or loosen a screw from (a hinge, bracket, etc.).
2.
to unfasten or withdraw by turning, as a screw or lid.
3.
to open (a jar, bottle, etc.) by turning the lid or cover.
verb (used without object)
4.
to permit of being unscrewed.

Origin:
1595–1605; un-2 + screw

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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Unscrew is one of our favorite verbs.
So is fletcherise. Does it mean:
to introduce subtleties into or argue subtly about.
to chew (food) slowly and thoroughly.
Collins
World English Dictionary
unscrew (ʌnˈskruː) [Click for IPA pronunciation guide]
 
vb
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
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Example sentences
Owners of the recalled cribs, are urged to unscrew the four corner posts
  immediately.
Unscrew a light bulb that uses a lot of electricity and replace it with one
  that uses much less.
Unscrew the valve from the scuba tank with a wrench.
Raccoons have learned how to work toggles and zippers, and can unscrew
  containers.
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