O cupim está malpassado e precisa de mais tempo.

Here, cupim is most likely the Brazilian beef cut called cupim (from the hump area of zebu cattle), not termite.

That matters because malpassado is normally used for meat, meaning something like rare or underdone depending on context.

O is the masculine singular definite article, meaning the.

So:

• o cupim = the cupim

In Portuguese, articles are used more often than in English. If you are talking about a specific piece of meat, o sounds natural.

Portuguese has two common verbs for to be: ser and estar.

Here, está is used because the cooking state is seen as a temporary condition:

• O cupim está malpassado. = The meat is underdone / rare right now.

If you used é, it would sound like being underdone were an essential characteristic, which does not fit well here.

Malpassado is a cooking term used for meat. It means the meat is not cooked enough, often rare or underdone, depending on context.

It is built from:

• mal = badly / insufficiently
• passado = cooked through / done

So the idea is not done enough.

In Brazilian Portuguese, malpassado is commonly written as one word when referring to the doneness of meat.

You may occasionally see variation in informal writing, but malpassado is the standard form learners should use for this meaning.

Because it agrees with cupim, which is masculine singular.

Agreement in Portuguese works like this:

• masculine singular: malpassado
• feminine singular: malpassada
• masculine plural: malpassados
• feminine plural: malpassadas

Examples:

• A carne está malpassada.
• Os bifes estão malpassados.

Because the verb precisar usually takes the preposition de when it means to need.

So:

• precisar de algo = to need something

Examples:

• precisa de tempo = needs time
• precisa de ajuda = needs help
• precisa de mais sal = needs more salt

So precisa de mais tempo is the normal structure.

Mais means more.

So:

• mais tempo = more time

A very common learner confusion is:

• mais = more
• mas = but

In this sentence, it is definitely mais because the idea is needs more time.

E means and.

It connects the two parts:

• O cupim está malpassado
• e precisa de mais tempo

So the whole structure is:

• The cupim is underdone and needs more time.

Yes. That is grammatically correct.

The original sentence:

• O cupim está malpassado e precisa de mais tempo

puts the focus first on the current state, then on the consequence.

Your version:

• O cupim precisa de mais tempo e está malpassado

is also natural, but it sounds slightly more focused on what needs to be done.

A simple pronunciation guide is:

o cu-PIM es-TA mal-pa-SA-do i pre-CI-za dji mais TEM-po

A few useful notes:

• cupim: stress on the last syllable, -pim
• está: stress on -tá
• precisa: stress on ci
• tempo: stress on tem

A rough IPA version in Brazilian Portuguese is:

/u kuˈpĩ isˈta mawpaˈsadu i pɾeˈsizɐ dʒi majs ˈtẽpu/

Depending on region, the pronunciation of de and tempo can vary slightly.

Because the sentence is talking about one piece/cut of meat.

So:

• o cupim = the cupim
• os cupins = the cupims / the pieces of cupim

If it were plural, other words would also change:

• Os cupins estão malpassados e precisam de mais tempo.

Notice the changes:

• o → os
• está → estão
• malpassado → malpassados
• precisa → precisam

Yes, but the meaning is a little different.

• está cru = it is raw
• está malpassado = it is underdone / rare / not cooked enough

So cru suggests less cooking than malpassado. For meat that has been cooked but still needs more time, malpassado is usually the better choice.

Yes, when cupim is used as a noun, it is masculine:

• o cupim
• os cupins

That is true whether it means termite or the beef cut. So any adjective agreeing with it will normally be masculine too unless the noun itself changes to a different word.

In this sentence, precisa refers back to o cupim.

Portuguese often leaves the subject unstated in the second part when it is the same as the first one:

• O cupim está malpassado e precisa de mais tempo.

This works like English:

• The cupim is underdone and needs more time.

The subject of needs is still the cupim.