WordReference Random House Learner's Dictionary of American English © 2017
smart al•eck (or  al•ec )/ˈsmɑrt ˈælɪk/USA pronunciation   n. [countable][Informal.]
  1. an annoying and obnoxious person who believes he or she is smarter than others.
smart--al•eck•y, smart--al•eck, adj.: the child's smart-alecky answers.

WordReference Random House Unabridged Dictionary of American English © 2017
smart al′eck  (alik),USA pronunciation 
  • an obnoxiously conceited person.
  • a wise guy.
  • smart-al′eck•y, smart-al′eck, adj. 
    • generic use of Aleck, nickname for Alexander 1860–65, American.

    Collins Concise English Dictionary © HarperCollins Publishers::

    smart aleck /ˈælɪk/ n ( pl smart alecks)
    1. informal an irritatingly oversmart person
    Etymology: 19th Century: from Aleck, Alec, short for Alexander

    ˈsmart-ˌaleck, ˈsmart-ˌalecky adj

    'smart aleck' also found in these entries:

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