Etymology
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Words related to un-

unthaw (v.)
1590s, "to thaw," from un- (2) "opposite of" + thaw (v.). Related: Unthawed; unthawing. Unthawed also sometimes is used with a sense "frozen" (1610s.).
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untie (v.)
Old English untigan "loosen, unchain," from un- (2) "opposite of" + tie (v.). Related: Untied; untying.
untwist (v.)
1530s, from un- (2) "reverse, opposite of" + twist (v.). Related: Untwisted; untwisting.
unveil (v.)
1590s, in reference to sight, "to make clear," from un- (2) "opposite of" + veil (v.). Sense of "to display or reveal" (something) is from 1650s. Related: Unveiled; unveiling.
unwind (v.)
early 14c., "to undo" (a bandage, wrapping, etc.), from un- (2) "opposite of" + wind (v.1). Similar formation in Old English unwindan "unveil, uncover," Dutch ontwinden, Old High German intwindan. Reflexive sense is recorded from 1740; figurative sense of "to release oneself from tensions, to relax" is by 1938. Related: Unwound; unwinding.
unwrap (v.)
late 14c., from un- (2) "opposite of" + wrap (v.). Related: Unwrapped; unwrapping.
unzip (v.)
1939, from un- (2) "opposite of" + zip (v.). Related: Unzipped; unzipping.

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