Of a selection, the property of having to choose explicitly to avoid or forbid something; a decision having the default option being inclusion or permission; used particularly with regard to mailing lists and advertisement.

The act of opting out of something. / (Britain, countable) A school or hospital that has withdrawn from local control.

(informal) To persist or continue to the end.

(baseball) A pitch which was intentionally thrown outside to the catcher who stands up with the pitch for the purpose of enabling the catcher to throw out a runner.

(baseball, intransitive) To intentionally throw the ball outside to the catcher who stands up with the pitch for the purpose of enabling the catcher to throw out a runner

To travel rapidly to a destination on an airplane / To have someone travel rapidly to a destination on an airplane / To rapidly emerge / (baseball) To become out by hitting a fly ball which is caught

(baseball) An instance of flying out

(electronics) To provide proper grounding for a circuit. / (baseball) To become out by hitting a ground ball which is fielded and leads to a force or tag of a runner.

(baseball) An instance of grounding out.

simple past tense and past participle of grind out