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Definition of Smart aleck
1. Noun. An upstart who makes conceited, sardonic, insolent comments.
Definition of Smart aleck
1. Noun. One who is given to obnoxious or insolent humor; a wise guy. ¹
2. Noun. One who is pretentious about their own cleverness or knowledge; a know-it-all. ¹
3. Noun. One who is obnoxiously self-assured; a show off. ¹
4. Noun. (rare) A well-dressed person. ¹
¹ Source: wiktionary.com