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smarty-pants

[ smahr-tee-pants ]
/ ˈsmɑr tiˌpænts /
Informal
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noun (used with a singular verb)

smart aleck: He's just a smarty-pants, showing off for some girls.
a smart person: My kid is a super smarty-pants who continues to get 4s on her state exams.
(used as a mildly abusive term of address or to refer to someone with contempt): Who invited that smarty-pants--everyone hates her!

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Origin of smarty-pants

First recorded in 1915–20
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2021

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British Dictionary definitions for smarty-pants

smarty-pants

smarty-boots (ˈsmɑːtɪˌbuːts)

/ (ˈsmɑːtɪˌpænts) /

noun

(functioning as singular) informal a would-be clever person
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
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