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an obnoxiously conceited person.
a wise guy.
noun (pl) smart alecks
(informal) an irritatingly oversmart person
An impudent or obnoxiously self-assertive individual, a wise guy, as in New teachers often have a hard time coping with the smart alecks in their classes. This expression, dating from the mid-1800s, probably alluded to a person of this description who was named Alec or Alexander, but his identity has been lost.


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