Que azar o nosso: o elevador parou de novo.

Because this is a very common exclamatory sentence fragment in Portuguese. Portuguese, like English, often leaves out words when the meaning is obvious.

So Que azar o nosso! is understood as something like:

• What bad luck for us!
• How unlucky we are!

You do not need a full sentence such as Isso é um azar nosso here. The short exclamation sounds much more natural.

O nosso means ours, but in this sentence it refers back to azar.

So the idea is:

• Que azar o nosso!
• literally: What bad luck, ours!
• more naturally: What bad luck for us! / What bad luck we have!

Portuguese often allows this kind of ellipsis, where the noun is understood and not repeated.

You can think of it as:

• o nosso [azar] = our bad luck

In Brazilian Portuguese, possessives are very often used with a definite article:

• o meu carro
• a nossa casa
• os seus livros

Here, o nosso works almost like ours in English, and the article helps turn the possessive into a full noun phrase.

So:

• o nosso = ours / our one / our situation

In this sentence, o matches the omitted noun azar, which is masculine singular.

Because it agrees with azar, and azar is a masculine singular noun.

Agreement in Portuguese follows the noun being described or referred to.

Examples:

• o nosso azar → masculine singular
• a nossa sorte → feminine singular
• os nossos problemas → masculine plural
• as nossas chaves → feminine plural

So in Que azar o nosso, nosso is masculine singular because the hidden noun is azar.

Yes. It sounds natural and idiomatic.

It is a very normal way to react to an annoying situation. It has a slightly expressive, conversational tone, like:

• Just our luck.
• What bad luck for us.

Other natural possibilities would be:

• Que azar!
• Que má sorte a nossa!
• Justo hoje! depending on context

But Que azar o nosso is absolutely natural.

The colon connects the reaction to the reason for that reaction.

Structure:

• Que azar o nosso = emotional comment
• o elevador parou de novo = explanation

So the colon works like:

• What bad luck for us: the elevator stopped again.

In English, you might also use a dash or even split it into two sentences:

• What bad luck for us—the elevator stopped again.
• What bad luck for us. The elevator stopped again.

Parou is the pretérito perfeito (simple past) of parar.

It means the action happened and is viewed as completed:

• o elevador parou = the elevator stopped

This tense is used for a specific event that happened.

Compare:

• o elevador parou = the elevator stopped
• o elevador está parado = the elevator is stopped / is not moving
• o elevador parava = the elevator used to stop / would stop / was stopping, depending on context

So here parou focuses on the event of it stopping.

Yes. In this sentence, de novo means again.

• o elevador parou de novo = the elevator stopped again

In Brazilian Portuguese, de novo is extremely common in everyday speech.

A more formal or more written-sounding alternative is:

• novamente

So these are both possible:

• O elevador parou de novo.
• O elevador parou novamente.

In normal conversation, de novo is usually the more common choice.

Yes, absolutely.

That version is also natural. The difference is mostly in style and emphasis:

• Que azar o nosso: o elevador parou de novo.
  Starts with the emotional reaction, then gives the reason.

• O elevador parou de novo. Que azar o nosso.
  Starts with the event, then adds the reaction.

Both are correct. The original version feels a bit more dramatic or expressive because it leads with the complaint.

Portuguese uses definite articles with nouns more often than English does.

So o elevador is the normal way to say the elevator.

In English, you sometimes omit an article in short comments, but in Portuguese the article often stays:

• o carro quebrou
• a luz apagou
• o elevador parou

Leaving out the article here would usually sound incomplete or unnatural in standard Portuguese.

Yes. Que má sorte a nossa! is a very similar sentence.

Compare:

• Que azar o nosso!
• Que má sorte a nossa!

Both mean something like What bad luck for us!

A small difference:

• azar is very common and direct
• má sorte is also common, and may sound a bit more literal as bad luck

Also notice the agreement change:

• azar is masculine → o nosso
• sorte is feminine → a nossa