The phrase is probably a shortened form of "shut up your mouth" or "shut your mouth up". Its use is generally considered rude and impolite, and may also be considered a form of profanity by some.
"Keep your mouth shut" is a very rude, often aggressive or threatening way of telling someone to stop talking, or to not say anything (maybe about a particular subject). You could say it to a friend in a non-serious way, but you wouldn't say it to someone you were being polite to.
There's no difference and both are impolite although “shut up” is oftentimes used in a joking way or can mean you don't believe someone.
If someone tells you to shut your mouth or shut your face, they are telling you very rudely to stop talking. [informal, rude, disapproval]
Who uses shut up? In general, shut up is often seen as a disrespectful way to dismiss someone. This can range from someone making a distracting noise while you're trying to work to stopping people from going on and on about something to trying to silence them because they are voicing an objectionable opinion.
It is generally considered rude to tell someone to shut up. Even if you phrase it more politely, they may still take offense as people believe they have the right to speak when they feel like it. Yet there are certain situations where it is fully justified and could save both your lives.
Many open mouth habits can be traced back to breathing issues such as allergies, chronic colds/stuffy noses, enlarged tonsils and adenoids, asthma, a deviated nasal septum, and much more. The interesting thing to note is that once the airway problem is resolved, the habit remains.
How to avoid choking? Make sure to chew every mouthful of food until it is small and soft enough to swallow. Sit down, take small bites, and don't talk or laugh with your mouth full! Do not put anything in your mouth that is not food or drink.
Mush. Slang for your mouth, i.e. shut your mush.
While it's considered rude to abruptly end a conversation, there are times when the best way to deal with a conflict is to stop talking altogether. If someone is being rude, aggressively persistent, or pushing your buttons in an unhealthy way, there are several strategies to make people stop talking.
Chew this over: Talking with your mouth full is no longer considered bad manners. Never talking with your mouth full is an outdated rule, according to half of people surveyed.
Most people are disgusted by diners eating with their mouths open. Chewing is widely expected to be performed with the lips absolutely shut. Then there is the etiquette of talking at dinner parties – in polite company everybody should be prepared to talk during dinner.
If someone's always mouthing off and just can't shut up, they've got logorrhea, a pathological inability to stop talking. Sounds better than "loudmouth."
Instead of focusing on the quiet, focus on what the other person is saying, and silence will come naturally. “The best tips I have for people seeking to become comfortable with speaking less are to slow down and listen,” says Wright.
A shut-in is a person confined indoors, especially as a result of physical or mental disability. Agoraphobe. Recluse. Invalid, or patient. Hikikomori, a Japanese term for reclusive adolescents or adults who withdraw from social life.
But trust your gut when you can sense that your partner is using these words to silence or manipulate you. For example, if my husband tells me to "shut up," this could be a sign that he does not value what I'm saying. Even in the throes of an argument, your partner should not be telling you to shut up.
Sign of Verbal Abuse #3: Telling You to Shut-Up
Berit Brogaard, D.M. Sci., Ph. D. writes in Psychology Today, “15 Signs of Verbal Abuse,” a sign of verbal abuse called “abusive anger.” This is when your partner screams and yells at you, or tells you to “shut-up.” Being told to shut up is not just rude behavior.
You can simply tell them that what they are doing is not correct and that they should try to make someone happy rather than sad. You could even ask them how they would feel if they were the ones receiving unkind remarks from other people.
"The best is what we call the DESC approach. Describe the situation, in detail, explaining what the problem is, and why. Make sure you have evidence to back this up. Then offer a solution - what you want them to do, and then the consequences: what will happen if they do - and don't do - as you ask."
Be explicit and you're more likely to succeed. Try, "During a meeting, please don't talk for more than one minute at a time" or, "During a discussion, after you make a point, please let other people respond." Now the talker knows your limits and has something to aim for.
You can simply say: “I've enjoyed talking to you, but I need to go now.” Or: “Sorry, but I don't have time to talk anymore.” If you're engaging with someone who is overly talkative, it's likely they know this, but just struggle to recognise when they're taking up more time than the other person wants to give.