smarty-pants

[smahr-tee-pants]
noun (used with a singular verb)

Origin:
1915–20

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World English Dictionary
smarty-pants or smarty-boots (ˈsmɑːtɪˌpænts, ˈsmɑːtɪˌbuːts)
 
n
informal (functioning as singular) a would-be clever person
 
smarty-boots or smarty-boots
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
If this smarty-pants machine is cleverer than me then it needs to prove itself.
Instead, it tosses brain twisters at four smarty-pants who are lured into a trap.
In our smarty-pants media culture, idealism is out of style.
Smarty-pants kids would say one thing and mean another thing entirely and drive their parents mad.
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