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.

(idiomatic) Indicates agreement, approval, encouragement.

(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-it-all

Knowing everything; omniscient.

plural of know-all

(ditransitive) To inform (someone) (of something).