smart aleck

Smart aleck is a negative term for a person who thinks he is intelligent and who always has an answer for everything. (noun)

An example of a smart aleck is the class clown who always shouts out when the teacher is asking questions.

Smart aleck describes someone or something that is annoying because they comes across as having know-it-all tendencies. (adjective)

An example of a smart aleck answer is a sarcastic reply to a question.

See smart aleck in Webster's New World College Dictionary

See smart aleck in American Heritage Dictionary 4

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