Definition of "knew"

I'll say I've knew this some time and tried to stop it—it was my business to stop it.

1916, Emerson Hough, The Man Next Door‎, chapter XXIV

[…] I've knew people that if they got a rag rug on the floor and a kewpie doll lamp on the phonograph they think they're runnin' a parlor house.'

1937, John Steinbeck, Of Mice and Men, Covici Friede

Oh, I figured you would've knew. That's where I met Ham and he got me in the DA's office. That was years ago."

1999, Steve Lopez, The Sunday Macaroni Club‎, Plume, page 242