What does "gag" mean?

Additional senses

1. 2.To cause to heave with nausea.
2. 3.To heave with nausea; to retch.
3. 4.To introduce gags or interpolations. See Gag, n., 3. [Slang] Cornill Mag.
4. 5.Sometimes thrust into the mouth or throat to hinder speaking.
5. 6.A mouthful that makes one retch; a choking bit; as, a gag of mutton fat. Lamb.
6. 7.A speech or phrase interpolated offhand by an actor on the stage in his part as written, usually consisting of some seasonable or local allusion. [Slang] Gag rein (Harness), a rein for drawing the bit upward in the horse's mouth. -- Gag runner (Harness), a loop on the throat latch guiding the gag rein.