(of a window) having two vertically sliding sashes, each closing a different part of the opening.
(of a window sash) sliding vertically, with a counterweight on each side.

1815–25 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
(of a window) having two vertical sashes, the upper one sliding in grooves outside those of the lower

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
Double-hung windows above the sink allow in air and light.
Opt for windows that are large, insulated, double-hung and well sealed.
Homeowners and co-op boards routinely replaced old steel frame windows with
  aluminum or vinyl-frame double-hung sash windows.
Displayed double-hung in their own gallery, they bear down on us relentlessly.
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