The difference between Flub and Flub up
When used as verbs, flub means to goof, fumble, or err in the performance of an action, whereas flub up means to flub.
Flub is also noun with the meaning: an error.
check bellow for the other definitions of Flub and Flub up
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Flub as a noun (informal):
An error; a mistake in the performance of an action.
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Flub as a verb (transitive):
To goof, fumble, or err in the performance of an action.
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Flub up as a verb (slang):
To flub; to botch or mess up.