Definitions for know-it-all
This page provides all possible meanings and translations of the word know-it-all
Random House Webster's College Dictionary
a person who acts as though he or she had better knowledge or understanding than anyone else.
Origin of know-it-all:
someone who thinks he knows everything and refuses to accept advice or information from others
Kernerman English Learner's Dictionary
sb who thinks they know everything
You're such a know-it-all.
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.
A know-it-all or know-all is a person who obnoxiously purports an expansive comprehension of a topic and/or situation when in reality, his/her comprehension is inaccurate or limited. This display may or may not be directly expressed. The German word Besserwisser is also used in some languages, literally meaning "better knowing [person]".
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