smart alec aleck Idiom
aleck
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smart aleck.
smart aleck
smart aleck 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.