Gag \Gag\, n.

1. Something thrust into the mouth or throat to hinder speaking.

2. A mouthful that makes one retch; a choking bit; as, a gag of mutton fat. --Lamb.

3. 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]

Source: Webster's Revised Unabridged Dictionary (1913)
 

Gag \Gag\, v. t. [imp. & p. p. Gagged; p. pr. & vb. n. Gagging.]

[Prob. fr. W. cegio to choke or strangle, fr. ceg mouth, opening, entrance.]

1. To stop the mouth of, by thrusting sometimes in, so as to hinder speaking; hence, to silence by authority or by violence; not to allow freedom of speech to. --Marvell.

The time was not yet come when eloquence was to be gagged, and reason to be hood winked. --Maccaulay.

2. To pry or hold open by means of a gag.

Mouths gagged to such a wideness. --Fortescue (Transl.).

3. To cause to heave with nausea.

Source: Webster's Revised Unabridged Dictionary (1913)
 

Gag \Gag\, v. i.

1. To heave with nausea; to retch.

2. To introduce gags or interpolations. See Gag, n., 3. [Slang] --Cornill Mag.

Source: Webster's Revised Unabridged Dictionary (1913)