A renda extra cobre uma despesa imprevista.

A is the feminine singular definite article, meaning the.

Here, renda is a feminine noun, so it takes a:

• a renda = the income
• uma renda = an income / some income

In this sentence, a renda extra sounds like a specific source of extra income already understood in context: the extra income.

Renda extra means extra income.

• renda = income
• extra = extra

It usually refers to money earned in addition to someone’s main income, such as freelance work, side jobs, or another source of earnings.

A native English speaker might want to translate it as extra money, but renda extra is a bit more specific: it suggests money coming in as income, not just random spare cash.

In Portuguese, adjectives usually come after the noun.

So:

• renda extra = extra income
• despesa imprevista = unforeseen expense

English often puts adjectives before the noun, but Portuguese normally places them after. That is the most natural order here.

Cobre comes from the verb cobrir, which basically means to cover.

In this sentence, it means:

• to cover the cost of
• to be enough to pay for

So A renda extra cobre uma despesa imprevista means that the extra income is enough to pay for an unexpected expense.

This is very similar to English cover in expressions like This will cover the bill.

Cobre is the third-person singular present tense form of cobrir.

Conjugation:

• eu cubro
• você/ele/ela cobre
• nós cobrimos
• vocês/eles/elas cobrem

Since the subject is A renda extra (a singular thing), the verb is cobre.

Because despesa is a feminine singular noun.

So:

• uma matches the feminine singular noun
• imprevista also matches the feminine singular noun

Agreement:

• uma despesa imprevista = a feminine singular noun + feminine singular adjective

If the noun were masculine, the forms would change:

• um gasto imprevisto

Both can relate to spending or expense, but they are not always used in exactly the same way.

• despesa often sounds a bit more formal or financial/accounting-like
• gasto is very common in everyday speech and can mean spending or an expense

Examples:

• uma despesa médica = a medical expense
• os gastos do mês = the month’s expenses/spending

In this sentence, despesa works very well because it sounds natural for a financial context.

Imprevista means unexpected, unforeseen, or unplanned.

It comes from imprevisto / imprevista, which describes something that was not anticipated.

So:

• uma despesa imprevista = an unexpected expense
• um problema imprevisto = an unforeseen problem

This word is common in financial, practical, and formal contexts.

Yes, you could say uma despesa inesperada, and it would also sound natural.

There is a slight nuance:

• imprevista = unforeseen, unplanned
• inesperada = unexpected

In many everyday contexts, they are very close.
For finances, despesa imprevista is especially common because it emphasizes that the expense was not budgeted or anticipated.

Yes. It is very common.

Portuguese uses cobrir in financial contexts much like English uses cover:

• O salário cobre o aluguel. = The salary covers the rent.
• Esse valor não cobre os custos. = That amount doesn’t cover the costs.
• A renda extra cobre uma despesa imprevista. = The extra income covers an unexpected expense.

So this is a very natural and useful pattern to learn.

Portuguese uses articles more often than English does.

Here:

• A renda extra = the extra income → specific/known
• uma despesa imprevista = an unexpected expense → one unspecified expense

The contrast is natural:

• a specific source of extra income
• one unexpected expense

Leaving the articles out would usually sound unnatural in this sentence.

The original sentence is already natural, but it sounds a little neutral or slightly financial/formal.

More everyday alternatives could be:

• A grana extra cobre uma despesa inesperada.
• Esse dinheiro extra cobre um gasto imprevisto.

Nuance:

• grana = informal for money
• dinheiro extra = extra money
• gasto = expense/spending, often more conversational

But A renda extra cobre uma despesa imprevista is perfectly good standard Brazilian Portuguese.

They are spelled the same but mean different things depending on context.

• cobre from cobrir = covers
• cobre as a noun = copper

In this sentence, it is clearly the verb because it comes after the subject A renda extra.

In Brazilian Portuguese, cobre is pronounced roughly like KOH-bree or KAW-bree, depending on accent. The final e is usually pronounced, unlike in English.

So context tells you whether cobre means covers or copper.