be OK

be OK

To be fine; to be not especially good or bad. A: "How have you been?" B: "Oh, I've been OK." These fries are OK, but they're not the best I've ever had.
See also: OK
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.

(I've) been okay.

Inf. a standard response to a greeting inquiry that asks how one has been. Bill: Well, how have you been, good buddy? John: I've been okay. Sue: How you doing? Jane: Been okay. And you? Sue: The same.
See also: been, okay
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.
See also:
References in periodicals archive ?
"We think at this point Aron will be OK for the start of the season," said Mackay.
As its origins are in Christianity, my faith should be OK with it, but the modern church is not, and goes to great lengths to warn congregations about it.