WordNet

touch with the mouth
the opening of a jar or bottle; "the jar had a wide mouth"
the opening through which food is taken in and vocalizations emerge; "he stuffed his mouth with candy" (同)oral_cavity, oral fissure, rima oris
a person conceived as a consumer of food; "he has four mouths to feed"
an opening that resembles a mouth (as of a cave or a gorge); "he rode into the mouth of the canyon"; "they built a fire at the mouth of the cave"
the externally visible part of the oral cavity on the face and the system of organs surrounding the opening; "she wiped lipstick from her mouth"
the point where a stream issues into a larger body of water; "New York is at the mouth of the Hudson"
articulate silently; form words with the lips only; "She mouthed a swear word"
make jokes or quips; "The students were gagging during dinner" (同)quip
cause to retch or choke (同)choke
struggle for breath; have insufficient oxygen intake; "he swallowed a fishbone and gagged" (同)choke, strangle, suffocate
make an unsuccessful effort to vomit; strain to vomit (同)heave, retch
restraint put into a persons mouth to prevent speaking or shouting (同)muzzle
prevent from speaking out; "The press was gagged" (同)muzzle
tie a gag around someones mouth in order to silence them; "The burglars gagged the home owner and tied him to a chair" (同)muzzle
a unit of force equal to the force exerted by gravity; used to indicate the force to which a body is subjected when it is accelerated (同)gee, g-force

PrepTutorEJDIC

(人・動物の物を食べたり,音を発する)『口』,口腔 / (口に似た)開口部;(袋・びんなどの)口,(銅穴・峡谷などの)入り口;河口,港口 / …‘を'大げさに口を動かし気どってしゃべる / 〈信じていないこと・理解していないこと〉‘を'口にする / …‘を'口に入れる,かむ,なめる
さるぐつわ;(歯科医の)開口器 / 人を黙らせるもの,言論を抑圧するもの / (…を)〈人〉‘の'口に詰める,(…で)〈人〉‘に'さるぐつわをはめる《+『名』+『with』+『名』》 / 〈人・権力などが〉…‘の'言論の自由を抑圧する / (飲みこめないで)吐き気を催す
ギャグ(だじゃれ)を言う / ギャグ,だじゃれ

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出典(authority):フリー百科事典『ウィキペディア（Wikipedia）』「2017/08/26 12:03:22」(JST)

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a woman wearing a ball gag

A gag is usually an item or device designed to prevent speech, often as a restraint device to stop the subject from calling for help and keep its wearer quiet. 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. The more "effective" a gag appears to be, the more hazardous it is: for example, duct tape is fairly effective at keeping one's mouth shut but is hazardous if for some reason (e.g., the common cold) the subject cannot breathe freely through the nose. For this reason, a gagged person should never be left alone.

The use of gags is commonly depicted in crime fiction and occasionally in action films, such as Raiders of the Lost Ark and its sequel Indiana Jones and the Kingdom of the Crystal Skull.

Very rarely, courts have been known to gag unruly defendants. Bobby Seale is one example.^[1]

During the filming of Rope, a camera operator's foot was broken by a heavy dolly during one intensive take, and to stop his vocal noises from being recorded on the film he was gagged and hauled out of the studio so that filming could continue without interruption.^[2]

Occasionally a cloth over-the-mouth gag is used not to prevent speech but to keep dust and aerosols out of the lungs.^[3]

Types of gags

Play media

3 Layer Gag - Stuff, Cleave, and Tape

One type of gag familiar in fiction, particularly in crime comics and novels, is a suitably sized piece of cloth pulled over the subject's mouth and tied at the back of his/her head. It is sometimes called the "detective gag" because many of its first appearances were in crime serials.

Sometimes a gag is pushed back between the victim's front teeth into the mouth, or with a hard ball in its middle or reinforced by pushing small cloth items into the mouth. This is common in BDSM, but in practice these sorts of gag can usually be got rid of by working the jaws about and/or pushing with the tongue, and they often do not stop the victim from making a loud inarticulate noise to call for help.

Often adhesive tapes are used for improvised gags. A tape gag can cause the skin on the lips to damaged in its removal or the adhesive can cause chemical burns or reactions.

Other uses of the word

The word "gag" has come to have various extended meanings, for example:

Various sorts of laws and orders preventing or stopping discussion or revealing of information, e.g., a parliamentary procedure to end a debate. See gag order.
A gag rule can be a part of court proceedings and congressional proceedings.
Gag (medical device), to keep the mouth open
A gag bit is a special bit type used with horses.

In symbolism

Sometimes in political cartoons, a character is shown gagged to represent that in the real world some law or rule or order is preventing him/her from speaking about some matter (see gag order).

References

^ Lukas, J. (1969-10-30). "Seale Put in Chains At Chicago 8 Trial; Judge Has Seale Chained and Gagged at Trial of the Chicago 8". The New York Times. ISSN 0362-4331. Retrieved 2016-03-06.
^ IMDb: Rope
^ Described, and called a "gag", in a recorded commentary in the Catalyst chemical industry museum in Runcorn (Cheshire, England), to keep alkali dust out of workers' lungs.

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English Journal

Cell culture adaptation mutations in foot-and-mouth disease virus serotype A capsid proteins: implications for receptor interactions.

Mohapatra JK1, Pandey LK2, Rai DK3, Das B2, Rodriguez LL2, Rout M2, Subramaniam S2, Sanyal A2, Rieder E2, Pattnaik B2.
The Journal of general virology.J Gen Virol.2014 Nov 7. pii: vir.0.071597-0. doi: 10.1099/vir.0.071597-0. [Epub ahead of print]
In this study we describe the adaptive changes fixed on the capsid of several foot-and-mouth disease virus serotype A strains during propagation in cell monolayers. Viruses passaged extensively in three cell lines (BHK-21, LFBK and IB-RS-2), consistently gained positively charged amino acids in the
PMID 25381054

Endoscopic, Transoral, Reduction of Epiglottic Entrapment Via Wire Snare Technique.

Coleridge MO1, DiGiovanni DL, Rodgerson DH, Spirito MA.
Veterinary surgery : VS.Vet Surg.2014 Oct 7. doi: 10.1111/j.1532-950X.2014.12280.x. [Epub ahead of print]
OBJECTIVE: To describe the use of a wire snare technique for epiglottic entrapment.STUDY DESIGN: Case series.ANIMALS: Eight adult horses.METHODS: Under general anesthesia, a modified mouth gag was placed in the oropharynx. An endoscope was passed through the gag until there was adequate visualizatio
PMID 25289732

Managing endodontic patients with severe gag reflex by glossopharyngeal nerve block technique.

Garg R1, Singhal A2, Agrawal K3, Agrawal N4.
Journal of endodontics.J Endod.2014 Sep;40(9):1498-500. doi: 10.1016/j.joen.2014.01.028. Epub 2014 Mar 6.
INTRODUCTION: Gagging is a protective reflex, but when the gag reflex becomes abnormally active, it poses a difficulty for the dentist because it hinders all aspects of dental procedures including diagnosis, radiography, and any form of active procedure.METHODS: In this case report, to overcome this
PMID 25146042

Japanese Journal

気管チューブ閉塞防止舌圧子付き小児用Dingman開口器の開発

櫻井淳
形成外科 56(4), 431-436, 2013-04
NAID 40019656380

口蓋裂を伴った Russell-Silver 症候群の1例

佐藤公治,相澤貴子,小林義和,近藤俊,今村基尊,水谷英樹,山田守正
日本口蓋裂学会雑誌 36(3), 202-207, 2011-10-25
【緒言】Russell- Silver症候群（以下RSSとする）は子宮内発育遅延，生後のcatch up growthを伴わない低身長，相対的大頭を伴う逆三角形の顔貌を特徴とする症候群で，顔面頭蓋の発育不全や左右非対称に起因する不正咬合に対し歯科矯正治療が行われることがあるが，口蓋裂の合併は希である。今回われわれは口蓋裂を伴ったRSSの1例を経験したので報告する。【症例】患児は当センター初診時6か …
NAID 10030795081