a young dog; puppy.
the young of certain other animals, as the rat or fur seal.
a small plant developing as an offshoot from a mature plant.
verb (used without object), pupped, pupping.
to give birth to pups.

1580–90; apocopated variant of puppy

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World English Dictionary
pup (pʌp)
1.  a.  a young dog, esp when under one year of age; puppy
 b.  the young of various other animals, such as the seal
2.  in pup (of a bitch) pregnant
3.  informal, derogatory chiefly (Brit) a conceited young man (esp in the phrase young pup)
4.  sell someone a pup to swindle someone by selling him something worthless
5.  slang (Austral) the night's a pup it's early yet
vb , pups, pupping, pupped
6.  (of dogs, seals, etc) to give birth to (young)
[C18: back formation from puppy]

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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Word Origin & History

1773, "a young dog," shortened form of puppy (q.v.). Used from 1589 for "conceited person." Applied to the young of the fur seal from 1815. Pup tent (also dog tent) is from 1863. Sopwith pup, popular name of the Sopwith Scout Tractor airplane, is from 1917.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Abbreviations & Acronyms
Puppis (constellation)
The American Heritage® Abbreviations Dictionary, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Example sentences for pups
Pups are usually left in the roost when they are not nursing.
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