Origin of know-it-all
Examples from the Web for know-it-all
He made an easy target, the know-it-all liberal egghead who demeaned the wisdom of the American people.
He was kind of a know-it-all, talked with a lot of authority on different subjects.Whitey Bulger’s Women: Inside the Terror and Glamour of His Ex-Girlfriends|T.J. English|June 11, 2012|DAILY BEAST
The reader can rest assured that behind all the blood and viscera is a know-it-all having some fun.Must Read Fiction: ‘Prague Fatale,’ ‘Derby Day’ and More|Malcolm Forbes, Hillary Kelly, Mythili Rao|May 9, 2012|DAILY BEAST
He can still come off like a windbag with a know-it-all air.
His whole life is models, gold leaf and marble columns, but he still sounds like a know-it-all down at the OTB.
None of the new girls appeared to be inclined toward a “know-it-all” attitude, for which Jane was grateful.Jane Stewardess of the Air Lines|Ruthe S. Wheeler
"She is—and she's just what you need," said Sue, with that know-it-all smile of hers.The Harbor|Ernest Poole
"I've a good mind not to tell you, Mr. Know-it-all," exclaimed Johnny Chuck.The Adventures of Reddy Fox|Thornton W. Burgess
He is impressed with the suggestion that the speaker is a "know-it-all" fellow.Certain Success|Norval A. Hawkins
He must keep in sympathetic touch with the new, damning the know-it-all frame of mind.The Conquest of Fear|Basil King