that's OK(redirected from that is O.K.)
A casual dismissal or refusal of what someone else has just said. A: "Do you need a bag?" B: "Nah, that's OK. I can just put those things in my purse." A: "Oh, sorry, I would have held the door if I'd seen you coming." B: "That's OK, don't worry about it."
See also: OK
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.