cancel out of (something)
To cease one's involvement in something. I had to cancel out of the play when I realized that its rehearsals conflicted with softball practice.
cancel someone out of something
and cancel someone out 1. to eliminate someone from something (as from a list of names). We had to cancel them out. We canceled out all the people who did not show up.
2. Sl. to eliminate someone; to kill someone. The drug lord threatened to cancel out his former partner for testifying against him.