(chiefly US, derogatory) Someone who claims to be knowledgeable or an expert in something, obnoxiously dismissing the opinions, advice, suggestions, etc. of others.

The knowledge and skill to be able to (do something correctly).

Used other than figuratively or idiomatically: see you, know. / (informal) Expression signifying a pause or hesitation.

(informal) To be aware of a situation, especially of the consequences of misconduct.

(transitive) To become acquainted with (someone or something); to meet someone. / Used other than figuratively or idiomatically: see get, know.

(chiefly UK, Ireland) Someone who obnoxiously claims to be knowledgeable on a subject.

plural of know-everything

Synonym of know-it-all / A highly knowledgeable person; expert.

Alternative form of know-everything

Someone who does not give a definite opinion in a questionnaire / Something one is uncertain about.