noun

1. A device to restrain speech, such as a rag in the mouth secured with tape or a rubber ball threaded onto a cord or strap.

2. An order or rule forbidding discussion of a case or subject.

3. A joke or other mischievous prank.

Synonyms: gag order, gag grouper

verb

1. To experience the vomiting reflex.

   “He gagged when he saw the open wound.”

2. To cause to heave with nausea.

3. To restrain someone's speech by blocking his or her mouth.