doorstop

[dawr-stop, dohr-]
noun
1.
a device for holding a door open, as a wedge or small weight.
2.
Also called slamming stile, stop. (in a doorframe) a strip or projecting surface against which the door closes.
3.
a device for preventing a door from striking a wall or an object on a wall, as a small rubber-covered projection.

Origin:
1870–75, Americanism; door + stop

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
doorstop (ˈdɔːˌstɒp)
 
n
1.  a heavy object, wedge, or other device which prevents an open door from moving
2.  a projecting piece of rubber, etc, fixed to the floor to stop a door from striking a wall
3.  informal a very thick book

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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FOLDOC
Computing Dictionary

doorstop definition


Used to describe equipment that is non-functional and halfway expected to remain so, especially obsolete equipment kept around for political reasons or ostensibly as a backup. "When we get another Wyse-50 in here, that ADM 3 will turn into a doorstop."
Compare boat anchor.
[Jargon File]

The Free On-line Dictionary of Computing, © Denis Howe 2010 http://foldoc.org
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Encyclopedia Britannica
Encyclopedia

doorstop

usually decorative and invariably heavy object used to prevent doors from swinging shut. Doorstops came into use about 1775 following the introduction of the rising butt, a type of hinge designed to close a door automatically. Many stops took the form of famous persons, such as Napoleon, Shakespeare, Wellington, Gladstone, and Disraeli. Animal forms were also popular

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
It is daunting in its resemblance to a giant doorstop.
You'd get as much value from this book if you used it as a doorstop.
And without the right software, the dongle is a mindless doorstop.
Doorstop biographies nearly always get mired in chronology and minutiae.
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