Verb

(en verb)

(rare) To rescind one's acceptance of.

* 1998 , Rethinking intuition: the psychology of intuition (Michael Raymond DePaul, William M. Ramsey), page 49:

Of course, they were free to unaccept that idea, but unacceptance was a secondary, deliberate revision of an initially accepted belief.

* 2000 , in Talking Nets: An Oral History of Neural Networks (James A. Anderson, Edward Rosenfeld), page 369:

I got this offer in California about an hour after I accepted Rosenfeld's job, so I called him right back. I was calling him about two or three hours after I'd accepted the job — to unaccept it. He was absolutely outraged.

Verb

(en verb)

To refuse to accept.

*

, title=(The Celebrity), chapter=4 , passage=One morning I had been driven to the precarious refuge afforded by the steps of the inn, after rejecting offers from the Celebrity to join him in a variety of amusements. But even here I was not free from interruption, for he was seated on a horse-block below me, playing with a fox terrier.}}

(basketball) To block a shot, especially if it sends the ball off the court.