No fim da reunião, eu vou descansar.

Because no is a contraction of em + o.

• em = in / at
• o = the

So:

• no fim = literally in the end or at the end

In natural English, we usually translate No fim da reunião as At the end of the meeting.

A similar pattern appears often in Portuguese:

• no começo = at the beginning
• no meio = in the middle
• no final = at the end

Da is a contraction of de + a.

• de = of
• a = the

So:

• fim da reunião = end of the meeting

The noun reunião is feminine, so it takes a:

• a reunião = the meeting

That is why you get:

• de + a reunião → da reunião

Both can relate to end, and in many situations they are very close.

In this sentence, no fim da reunião sounds completely natural and common.

A learner may also hear:

• no final da reunião

This is also correct and very common in Brazilian Portuguese.

Very roughly:

• fim often refers to the end point itself
• final can feel a little more like the final part/stage

But in everyday speech, especially in expressions like this, they often overlap.

So these are both fine:

• No fim da reunião, eu vou descansar.
• No final da reunião, eu vou descansar.

Yes, it can often be omitted.

Portuguese frequently drops subject pronouns when the verb already makes the subject clear. So:

• Eu vou descansar.
• Vou descansar.

Both are natural.

Why include eu then?

Common reasons:

• for emphasis
• for clarity
• for contrast

For example:

• Ela vai trabalhar, mas eu vou descansar.

Here eu is useful because it contrasts with ela.

In your sentence, eu is not required, but it is perfectly correct.

Vou descansar is the very common ir + infinitive future structure in Portuguese.

• vou = I go / I am going
• descansar = to rest

Together, it means:

• I’m going to rest
• often also simply I will rest

Portuguese also has a simple future form:

• descansarei = I will rest

But in everyday Brazilian Portuguese, vou descansar is much more common in normal conversation.

So:

• vou descansar = natural, common spoken Brazilian Portuguese
• descansarei = correct, but more formal or less common in everyday speech

Not necessarily.

Just like in English, going to can refer to a plan or expected future action, not only something happening right away.

In this sentence:

• No fim da reunião, eu vou descansar.

it means that after the meeting ends, resting is the plan.

So it is a future action connected to that moment, not necessarily something happening right now.

Descansar usually means to rest.

It can mean:

• resting your body
• taking a break
• recovering energy
• sleeping or lying down, depending on context

Sometimes English might translate it as relax, but descansar is more directly to rest.

Examples:

• Preciso descansar. = I need to rest.
• Vou descansar um pouco. = I’m going to rest a little.

If you specifically want to relax, Portuguese can also use:

• relaxar

But descansar is very common and natural when talking about taking a break or recovering energy.

The phrase No fim da reunião is an introductory time expression.

Portuguese often uses a comma after an introductory phrase like that, especially in writing.

So the sentence structure is:

• No fim da reunião, = At the end of the meeting,
• eu vou descansar. = I’m going to rest.

The comma helps separate the time expression from the main clause.

In casual writing, people are not always strict about commas, but here the comma is standard and helpful.

Yes, depending on context, that translation can work.

The core meaning of descansar is to rest, but in natural English, relax may sound more idiomatic in some situations.

Still, if you are learning vocabulary, it is best to remember:

• descansar = to rest

Then, in context, you can decide whether rest, take a break, or sometimes relax sounds best in English.

Reunião is pronounced approximately like heh-oo-nee-OWN in Brazilian Portuguese, though English spelling cannot show it perfectly.

A few useful points:

• the r at the start of a word in Brazilian Portuguese is often pronounced like an English h
• ão is a very common nasal ending in Portuguese
• the stress is on the last syllable: reu-ni-ÃO

The ending -ão appears in many nouns:

• reunião = meeting
• situação = situation
• informação = information

This nasal sound is important in Portuguese pronunciation, so it is worth practicing.

Yes. That would also be correct, but it is slightly different in meaning.

• No fim da reunião = at the end of the meeting
• Depois da reunião = after the meeting

The first one focuses on the ending point of the meeting itself. The second one focuses more generally on the time following the meeting.

In many real situations, both may work, but they are not always identical.

Yes, it is completely natural.

A Brazilian speaker might say:

• No fim da reunião, eu vou descansar.
• No final da reunião, vou descansar.
• Depois da reunião, vou descansar.

All of these sound normal, with small differences in style or nuance.

Your original sentence is grammatical, clear, and natural.