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yup

[yuhp]
adverb, noun Informal.
  1. yes.
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Also yep.

Origin of yup

form of yeah as an isolated or emphatic utterance, with p representing closing of the lips, creating, in effect, an unreleased labial stop (and perhaps also lowering the vowel); compare the parallel use of p in nope
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for yups

yup

sentence substitute
  1. an informal word for yes
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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

Word Origin and History for yups

yup

1906, variant of yes.

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Online Etymology Dictionary, © 2010 Douglas Harper