O homem baralhou o baralho.

Because o is the masculine singular definite article, equivalent to the.

So:

• o homem = the man
• o baralho = the deck

Both nouns are masculine singular here, so they both use o.

If you wanted an indefinite meaning, you would use um instead:

• Um homem baralhou um baralho. = A man shuffled a deck.

Baralhou is the 3rd person singular of the verb baralhar in the pretérito perfeito simples.

In practical terms, that means it refers to a completed action in the past:

• baralhar = to shuffle
• baralhou = shuffled

Because it is 3rd person singular, baralhou could mean:

• he shuffled
• she shuffled
• it shuffled
• sometimes you shuffled with você

In this sentence, the subject is o homem, so it means the man shuffled.

They are from the same word family.

• baralho = deck of cards
• baralhar = to shuffle
• baralhou = shuffled

So Portuguese uses closely related words where English uses two different common words: deck and shuffle.

That is perfectly normal in Portuguese. A learner may feel the sentence sounds repetitive, but to a native speaker it is completely natural.

lh is a single consonant sound in Portuguese. It is not pronounced as separate l + h.

For an English speaker, it is roughly similar to the lli sound many people use in million. It is a soft ly-type sound.

So:

• baralho sounds roughly like buh-RA-lyoo in European Portuguese
• baralhou sounds roughly like buh-rah-LYOH

Those are only approximations, but the key point is that lh should sound like one smooth ly sound, not like a plain English l.

In homem, the final m is not pronounced as a strong English m sound.

Instead, it helps make the vowel before it nasal. That means the end of the word has a nasal quality rather than a fully pronounced consonant.

So homem should not sound like ho-mem in English.

A rough guide is something like OH-mẽy for European Portuguese, with a nasal ending. The exact sound takes practice, but the important thing is:

• stress on the first syllable
• the ending is nasal
• the final m is not a full English m

Because the subject is already stated: o homem.

Portuguese does not need an extra subject pronoun when the subject is clear. In fact, adding ele here would usually be unnecessary:

• O homem baralhou o baralho. = natural
• Ele baralhou o baralho. = also possible, but only if he is already understood from context
• O homem ele baralhou o baralho. = generally not the normal neutral way to say it

So once o homem is there, no pronoun is needed.

Yes. This sentence uses the normal subject–verb–object order:

• O homem = subject
• baralhou = verb
• o baralho = object

So it matches English very closely:

• The man / shuffled / the deck

Portuguese can sometimes change word order for emphasis, style, or literature, but this sentence is the most neutral and standard order.

Baralho by itself very often means a deck of cards, especially when the context is obvious.

So this sentence is perfectly natural.

You can also say:

• baralho de cartas = deck of cards

That is just more explicit. In many everyday situations, baralho alone is enough.

Yes. Besides the literal meaning to shuffle, baralhar can also mean to mix up or to confuse.

For example:

• Isso baralha-me. = That confuses me.
• As ideias ficaram baralhadas. = The ideas got mixed up.

So the core idea is something being mixed, scrambled, or made less clear.

In your sentence, though, the meaning is the literal card-related one.

The plural is homens.

So:

• o homem = the man
• os homens = the men

This is a useful form to learn early because it is common and not completely obvious to English speakers.

Example:

• Os homens baralharam o baralho. = The men shuffled the deck.

Notice the other changes too:

• o → os
• baralhou → baralharam

You would change baralhou to baralha:

• O homem baralha o baralho.

That means The man shuffles the deck or The man is shuffling the deck, depending on context.

So the contrast is:

• baralha = present
• baralhou = completed past

The verb agrees with the subject, which is o homem, not with the object o baralho.

So:

• O homem baralhou o baralho.
  • subject = o homem
  • verb = baralhou
  • object = o baralho

If the subject changed to plural, the verb would change too:

• Os homens baralharam o baralho.

But if only the object changed, the verb would stay singular:

• O homem baralhou os baralhos.

So verb agreement follows the subject, not the object.