Usually means: Person who claims excessive knowledge.
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We found 21 dictionaries that define the word know-it-all:

General (19 matching dictionaries)
  1. know-it-all: Merriam-Webster
  2. know-it-all: Oxford Learner's Dictionaries
  3. know-it-all: American Heritage Dictionary of the English Language
  4. know-it-all, know-it-all: Collins English Dictionary
  5. know-it-all: Vocabulary.com
  6. know-it-all: Wordnik
  7. know-it-all: Cambridge Advanced Learner's Dictionary
  8. know-it-all: Wiktionary
  9. know-it-all: Webster's New World College Dictionary, 4th Ed.
  10. know-it-all: Infoplease Dictionary
  11. know-it-all: Dictionary.com
  12. know-it-all: Cambridge Essential American English Dictionary
  13. Know-It-All, Know-it-all, The Know-It-All: Wikipedia, the Free Encyclopedia
  14. know-it-all: Rhymezone
  15. know-it-all: FreeDictionary.org
  16. know-it-all: Mnemonic Dictionary
  17. know-it-all: TheFreeDictionary.com

Business (1 matching dictionary)
  1. know-it-all: Legal dictionary

Slang (1 matching dictionary)
  1. know-it-all: Urban Dictionary

(Note: See know-it-alls as well.)

Definitions from Wiktionary (
)
American English Definition British English Definition
noun:  (chiefly US, derogatory) Someone who claims to be knowledgeable or an expert in something, obnoxiously dismissing the opinions, advice, suggestions, etc. of others.

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