verb (used with object), verb (used without object), flubbed, flubbing.
to perform poorly; blunder; bungle: He flubbed the last shot and lost the match.
a blunder.

1920–25, Americanism; origin uncertain

flubber, noun
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
flub (flʌb)
1.  an embarrasssing mistake or blunder
vb , flubs, flubbing, flubbed
2.  (intr) to blunder or make an embarrasssing mistake
[C20: of origin unknown]

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

1924, Amer.Eng., perhaps influenced by fluff, flop, etc.
Online Etymology Dictionary, © 2010 Douglas Harper
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Computing Dictionary

FLUB definition

The abstract machine for bootstrapping STAGE2.
[Mentioned in Machine Oriented Higher Level Languages, W. van der Poel, N-H 1974, p. 271].

The Free On-line Dictionary of Computing, © Denis Howe 2010 http://foldoc.org
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Example sentences
Anything can happen, and any flub will be amplified beyond recognition.
She's made the odd flub or three, including muddling up her revolutionary history.
If you're going to flub a power-drive, this is the club for bailing you out of trouble.
If we've learned anything over the past year, it's that incremental improvements are incredibly easy to flub.
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