Definitions for know-it-all
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Random House Webster's College Dictionary
know′-it-all`(n.)
a person who acts as though he or she had better knowledge or understanding than anyone else.
Origin of know-it-all:
1930–35
Princeton's WordNet
know-it-all, know-all(noun)
someone who thinks he knows everything and refuses to accept advice or information from others
Kernerman English Learner's Dictionary
know-it-all(noun)ˈnoʊ ɪŋ
sb who thinks they know everything
You're such a know-it-all.
Wiktionary
know-it-all(Noun)
Someone who obnoxiously claims to be knowledgeable on a subject.
We had it all figured out, but this know-it-all marched in with "the correct way of solving it", leaving our experiment in shambles.
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"know-it-all." Definitions.net. STANDS4 LLC, 2013. Web. 25 May 2013. <http://www.definitions.net/definition/know-it-all>.