know-it-all definition by Webster's New World
Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio. Used by arrangement with John Wiley & Sons, Inc.
Informal pretending or claiming to know much about almost everything
Informal a know-it-all person
know-it-all definition by American Heritage Dictionary
The American Heritage® Dictionary of the English Language, 4th edition Copyright © 2010 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
One who claims to know everything and rejects advice or information from others.
- knowˈ-it-allˌ adjective
know-it-all - Phrases/Idioms
see know all the answers.