To stop up the mouth or throat of (a person) with some solid body, so as to prevent him from speaking; hence, to silence by authority or by violence; restrain from freedom of speech.To pry or keep open by means of a gag.To cause to heave with nausea.To stop or choke up, as a valve or passage.To introduce interpolations into: as, to gag a part.To play jokes upon; joke; guy.Synonyms Gag, Muzzle, Muffle; stifle. To gag is to silence by thrusting something into the mouth and securing it in place. To muzzle a dog, or other creature having a projecting mouth, is to incase the mouth and nose (muzzle) in a framework called a muzzle, in order to prevent him from biting or eating. Both gag and muzzle are sometimes used figuratively for the act of silencing effectively by moral compulsion, gag implying also roughness or severity in the performance: as, a muzzled press; to gag a public speaker by threats of violence. To muffle is primarily to conceal by wrapping up, but the word has a secondary use to express the deadening of sound, by wrapping (as an oar) or otherwise (as a drum).To retch; heave with nausea.To interpolate words of one's own into one's part: said of an actor.n. Something thrust into the mouth or throat to prevent speech or outcry; hence, any violent or authoritative suppression of freedom of speech.n. A mouthful which produces nausea and retching, or threatens with choking.n. An apparatus or device for distending the jaws, such as is used in various surgical operations; hence, anything used to pry or keep open the jaws.n. In coal-mining, a chip of wood in a sinking pit-bottom or sump.n. An interpolation introduced by an actor into his part, whether in accordance with custom or with his own fancy.n. A joke, especially a practical joke; a farce; a hoax.n. A common name of Mycteroperca microlepis, a large serranoid fish, attaining a length of two or three feet: found on the southern Atlantic and Gulf coasts of the United States.