Ngồi yên.

• ngồi = to sit
• yên = still, calm, settled, quiet

Together, ngồi yên means sit still or stay seated and keep still.

In this sentence, yên describes the state you should be in while sitting.

Vietnamese often leaves out the subject when it is obvious from context, especially in commands.

So Ngồi yên. naturally means:

• Sit still.
• You, sit still.

This is very common in everyday Vietnamese. If needed, you can add a pronoun or name:

• Con ngồi yên. = Sit still, said to a child
• Em ngồi yên. = You sit still, to someone younger
• Anh ngồi yên. = You sit still, to an older male or husband/boyfriend in some contexts

Yes. It is a short imperative sentence.

It sounds direct and natural, especially when:

• speaking to a child
• telling someone not to move
• giving an instruction quickly

By itself, it can sound firm or even a little sharp, depending on tone of voice. Vietnamese often changes how strong a command feels by adding small words or pronouns.

For example:

• Ngồi yên nhé. = softer, like Sit still, okay?
• Ngồi yên đi. = urging someone to do it
• Con ngồi yên nào. = gentle, often to a child

Vietnamese often uses a verb + complement pattern.

Here:

• ngồi = the action
• yên = the resulting state or manner

So ngồi yên is literally something like:

• sit in a still/calm way
• remain sitting and still

This is very natural in Vietnamese. Similar patterns are common:

• đứng yên = stand still
• nằm yên = lie still
• giữ yên = keep still / keep steady

Here, still is usually the best translation.

But yên can also carry ideas like:

• calm
• settled
• not moving
• not causing disturbance

So Ngồi yên can sometimes feel a bit broader than just physical stillness. Depending on context, it may imply:

• do not move around
• behave calmly
• stop fidgeting

That is why it is often said to children.

A simple pronunciation guide:

• Ngồi ≈ ngoy with a falling tone on the vowel
• yên ≈ yeen with a level tone

A few pronunciation notes:

• ng at the beginning is like the ng sound in sing, but Vietnamese allows it at the start of a word. English does not normally do this, so learners often need practice.
• ồi in ngồi is not exactly English oy, but that approximation helps at first.
• yên starts with a y sound like yes.

If you are learning tones:

• ngồi has the huyền tone
• yên has the ngang tone

They are close, and in many situations both can mean sit still.

But there is a slight difference:

• ngồi yên = sit still, stay settled, do not move around
• ngồi im = sit quietly, sit without speaking or making noise, sit motionless

In real speech, the difference can blur. But very roughly:

• yên often focuses more on being settled or not moving
• im often suggests silence or complete quiet

Sometimes people even combine them:

• Ngồi im yên nào. = Sit quietly and keep still.

It is very often used with children, because adults tell children to sit still all the time.

You can use it with adults too, but context matters:

• between close friends: possible
• in an emergency or urgent situation: possible
• from a superior to a subordinate: possible
• to a stranger or someone you should speak politely to: it may sound too blunt

With adults, people often soften it:

• Anh ngồi yên nhé.
• Chị ngồi yên một chút nhé.
• Xin ngồi yên. in more formal situations

You can soften it by adding particles, pronouns, or both.

Common softer versions:

• Ngồi yên nhé. = Sit still, okay?
• Ngồi yên nào. = gentle, often to a child
• Con ngồi yên nhé. = gentle to a child
• Em ngồi yên một chút nhé. = Please sit still for a moment
• Mời anh ngồi yên một lát. = more polite/formal

Be careful with đi:

• Ngồi yên đi.

This can sometimes sound like a straightforward push: Come on, sit still. It is common and natural, but not always especially polite.

Yes, it is grammatically correct, but it sounds more formal, written, or instructional.

• Ngồi yên. = natural everyday command
• Hãy ngồi yên. = more like Please sit still in instructions, announcements, or careful speech

In everyday conversation, people usually prefer the shorter Ngồi yên.

Yes, it can.

Depending on context, Ngồi yên may mean:

• sit still
• stay seated
• don’t get up
• stop moving around

For example, if someone is about to stand up and you say Ngồi yên, it may mean Stay seated. If a child is wriggling around, it means Sit still.

So the exact English translation depends on the situation.

Yes. A few common expansions are:

• Ngồi yên một chút. = Sit still for a moment.
• Ngồi yên ở đây. = Sit still here / Stay seated here.
• Ngồi yên một chỗ. = Sit still in one place.
• Con ngồi yên coi. = Sit still, okay / Sit still for a second.
• Ngồi yên để bác xem nào. = Sit still so I can take a look.

These longer versions are very common because Vietnamese often adds extra words to show tone, relationship, and purpose.

A few useful contrasts are:

• đứng lên = stand up
• đừng cựa quậy = don’t fidget / don’t squirm
• đừng nhúc nhích = don’t move
• ngồi xuống = sit down

So depending on context:

• Ngồi yên! = Sit still!
• Đừng nhúc nhích! = Don’t move!
• Ngồi xuống và ngồi yên. = Sit down and sit still.

These are good to learn together because they often appear in the same situations.