parting strip

American

noun

a strip, as of wood, used to keep two parts separated, as one in each side of the frame of a window to keep the sashes apart when lowered or raised.

parting strip British

noun

a thin strip of wood, metal, etc, used to separate two adjoining materials

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

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parting strip

The parting strip is a thin piece of wood that fits into a groove, so it isn’t easy to pry out.

From Washington Post ● Aug. 17, 2018

Then, on at least one side of the window, remove the parting strip that separates the upper and lower sashes.

From Washington Post ● Aug. 17, 2018

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023