gag

v. place something in or over the mouth in order to prevent speech or other sounds; begin to vomit; choke; cause to vomit; cause choking; make jokes

n. something which is placed in or over the mouth in order to prevent speech or other noise; joke

A gag is usually a device designed to prevent speech, often as a restraint device to stop the subject from calling for help. This is usually done by blocking the mouth, partially or completely, or attempting to prevent the tongue, lips, or jaw from moving in the normal patterns of speech. They are often less effective in reality than in crime fiction. They carry a strong risk of killing the victim by suffocation. The more "effective" a gag appears to be, the more hazardous it is: for example, duct tape is fairly effective but is hazardous if for some reason (e.g. the common cold) the subject cannot breathe freely through the nose.
See more at Wikipedia.org...

The word gag has a variety of meanings: Gag, a device designed to prevent speechGag (BDSM) used in BDSM activitiesA comedian's term for a joke, a comedic sketch or routine, or the visible effect of a magical illusion, see visual gag.A gag gift is an informal term for practical joke deviceGag bit, a type of bit used for strong horsesGag reflex, the feeling of choking or accompanying involuntary muscular contractions in the throatIn law, a gag order is a writ or court order taken out with an intent to prevent information or comment from being made publicThe Jennings gag, the Whitehead gag and the Hallam gag are forms of a gag (medical device) used by dentists, surgeons and veterinarians to hold the patient's mouth openA gag cartoon, a one-panel comic that is usually intended to have ridiculous happenings. It may also be used as a political cartoon.Yonkoma, a form of Japanese gag comic strip
See more at Wikipedia.org...

Gag 1. a surgical device for holding the mouth open. 2. to retch, or to strive to vomit. gag v. 1. To choke, retch, or undergo a regurgitative spasm. [more]Gag - Community and Resources

Noun
1. a humorous anecdote or remark intended to provoke laughter; "he told a very funny joke"; "he knows a million gags"; "thanks for the laugh"; "he laughed unpleasantly at hisown jest"; "even a schoolboy's jape is supposed to have some ascertainable point"
(synonym) joke, laugh, jest, jape
(hypernym) wit, humor, humour, witticism, wittiness
(hyponym) belly laugh, sidesplitter, howler, thigh-slapper, scream, wow, riot
(part-meronym) punch line, laugh line, gag line, tag line
(derivation) quip
2. restraint put into a person's mouth to prevent speaking or shouting
(synonym) muzzle
(hypernym) restraint, constraint
(derivation) muzzle
Verb
1. prevent from speaking out; "The press was gagged"
(synonym) muzzle
(hypernym) hush, quieten, silence, still, shut up, hush up
(derivation) muzzle
2. be too tight; rub or press; "This neckband is choking the cat"
(synonym) choke, fret
(hypernym) compress, constrict, squeeze, compact, contract, press
3. tie a gag around someone's mouth in order to silence them; "The burglars gagged the home owner and tied him to a chair"
(synonym) muzzle
(hypernym) tie, bind
(derivation) muzzle
4. make jokes or quips; "The students were gagging during dinner"
(synonym) quip
(hypernym) joke, jest
(derivation) joke, laugh, jest, jape
5. struggle for breath; have insufficient oxygen intake; "he swallowed a fishbone and gagged"
(synonym) choke, strangle, suffocate
(hypernym) suffer, hurt
6. cause to retch or choke
(synonym) choke
(hypernym) sicken
7. make an unsuccessful effort to vomit; strain to vomit
(synonym) heave, retch

n. gag, something which is placed in or over the mouth in order to prevent speech or other noise; joke, gimmick