मोमबत्ती बुझाओ।

A common transliteration is mombattī bujhāo.

A simple English-friendly approximation is:

• मोमबत्ती = mome-but-TEE
• बुझाओ = boo-JHAA-o

A few notes:

• मोमबत्ती has stress-like emphasis near the end: ...त्ती
• बुझाओ has three parts: bu + jhā + o
• The झ sound is a breathy jh sound, which may feel unfamiliar at first

You do not need perfect pronunciation right away; mombattī bujhāo will usually be understood.

The sentence has two parts:

• मोमबत्ती = candle
• बुझाओ = put out / extinguish / blow out (a command)

So the structure is basically:

• मोमबत्ती = the object
• बुझाओ = the command verb

Hindi often puts the object before the verb, so this order is very normal.

The -ओ ending here marks an imperative form, meaning a command.

The verb is based on बुझाना, which means to extinguish / to put out.
From that verb, बुझाओ is a command form used with tum.

So:

• बुझाना = to extinguish
• बुझाओ = extinguish! / put it out!

This is one of the common command patterns in Hindi.

बुझाओ is usually the tum command form, so it is:

• natural with friends
• natural with children
• natural with someone you speak to casually

It is not the most polite form.

If you want to be more polite, you would usually say:

• मोमबत्ती बुझाइए।

That is more appropriate for:

• strangers
• elders
• formal situations
• respectful speech

A polite version is:

• मोमबत्ती बुझाइए।

You may also hear:

• मोमबत्ती बुझा दीजिए।

This sounds even softer/more polite, like:

• Please put out the candle

So the rough politeness scale is:

• बुझा = very direct / intimate
• बुझाओ = casual
• बुझाइए = polite
• बुझा दीजिए = politely asking someone to do it

Yes, मोमबत्ती is feminine.

However, in this sentence, the verb form बुझाओ does not change for the gender of मोमबत्ती. That is because this is an imperative command.

So even though मोमबत्ती is feminine, you still say:

• मोमबत्ती बुझाओ।

Gender matters more in many other verb forms, but not in this command form.

Because मोमबत्ती is being used as a direct object, and Hindi often leaves off को with inanimate direct objects.

So:

• मोमबत्ती बुझाओ। = completely normal

You might hear को in some contexts for emphasis or specificity, but in this kind of everyday command, it is usually omitted.

For a learner, the natural pattern to remember is:

• object + verb
• no को needed here

It most literally means extinguish / put out.

In context, with a candle, English often says blow out the candle, but Hindi बुझाओ does not specifically say how you do it. It just means to make the flame go out.

So it can cover:

• blowing it out
• snuffing it out
• otherwise extinguishing it

If the meaning shown to the learner is blow out the candle, that is a natural English translation, even though the Hindi verb itself is broader.

This is a very useful distinction:

• बुझना = to go out / be extinguished
  
  • intransitive: the flame goes out by itself
• बुझाना = to put out / extinguish something
  
  • transitive: someone causes it to go out

Examples:

• मोमबत्ती बुझ गई। = The candle went out.
• मोमबत्ती बुझाओ। = Put out the candle.

So in your sentence, बुझाओ comes from the transitive verb बुझाना, because someone is being told to do the action.

The normal order is:

• मोमबत्ती बुझाओ।

This is the most neutral and natural order: object + verb.

Hindi word order is somewhat flexible, so other orders are sometimes possible for emphasis, but for a learner, the standard form to use is:

• मोमबत्ती बुझाओ।

Putting the verb at the end is the safest and most natural pattern in simple Hindi sentences.

Usually no, not for a candle flame.

• बंद करो means turn off / stop / shut
• बुझाओ means put out / extinguish

You would say:

• लाइट बंद करो। = Turn off the light.
• मोमबत्ती बुझाओ। = Put out the candle.

So for fire, flame, lamps, candles, etc., बुझाना is the right idea, not बंद करना.

As written, मोमबत्ती is singular: candle.

For more than one candle, you could say:

• मोमबत्तियाँ बुझाओ। = Put out the candles.

So the main change is in the noun:

• मोमबत्ती = candle
• मोमबत्तियाँ = candles

The command verb बुझाओ can stay the same if you are still speaking to tum.

Yes, it is natural Hindi.

A native speaker might say it in situations like:

• during a birthday celebration
• before going to sleep
• for safety
• when asking a child or friend to put out a candle

Depending on tone and politeness, they might choose:

• मोमबत्ती बुझाओ। = casual
• मोमबत्ती बुझाइए। = polite
• मोमबत्ती बुझा दो। = casual, very common in speech
• मोमबत्ती बुझा दीजिए। = polite request

So your sentence is correct and usable; it is just one point on the politeness scale.