Third-person singular simple present indicative form of know someone

(set phrase) To recognize that a statement or belief is false or doubtful. / (set phrase) To understand that certain behavior is wrongful, futile, or inappropriate.

(Ireland, dated) God knows; nobody knows / (Ireland, dated) God knows; of course, certainly, nobody could doubt

Knowing of itself, or without the communication from another.

plural of Know-Nothing

Alternative form of you know what

(idiomatic) To have personal or social connections.

(UK, transitive) To have very thorough knowledge of.

Alternative form of God knows

(informal) To be acquainted with the normal process or procedure of a given activity or situation; to be familiar with how something is done.