A divulgação usa a locução.

Because divulgação is a feminine singular noun, so it normally takes the feminine singular definite article a.

• a divulgação = the publicity / the promotion / the dissemination
• o livro = the book
• a casa = the house

So in this sentence, A divulgação is simply the subject.

No. In this sentence, the second a is also an article, not a preposition.

Here is the structure:

• A divulgação = subject
• usa = verb
• a locução = direct object

So:

• first A = the
• second a = the

This matters because English speakers often see a and wonder whether it means to. Here, it does not mean to.

Because the subject, a divulgação, is singular.

The verb usar in the present tense is:

• eu uso
• você/ele/ela usa
• nós usamos
• vocês/eles/elas usam

Since divulgação is a singular noun, Portuguese uses the third-person singular form:

• A divulgação usa...

If the subject were plural, then you would use usam:

• As divulgações usam...

Divulgação comes from the verb divulgar, which means something like to publicize, to spread, to disclose, or to promote, depending on context.

As a noun, divulgação can mean:

• publicity
• promotion
• dissemination
• public release

The exact English word depends on context. In marketing, it often suggests promotion/publicity. In more general contexts, it can mean dissemination or spreading information.

Locução can have a few meanings in Portuguese, depending on context. Common ones include:

• a set expression
• a fixed phrase
• a formulaic wording
• in some contexts, announcing/speaking style or voice work

In grammar and vocabulary discussions, locução often means a multi-word expression, such as:

• locução adverbial
• locução verbal
• locução prepositiva

So if the meaning shown to the learner is something like expression or phrase, that is very natural.

Because locução is a more specific word.

Very roughly:

• frase = a sentence or phrase in a broad sense
• expressão = expression
• locução = a fixed or recognized group of words functioning together

For example, in grammar:

• de repente can be called a locução adverbial
• por causa de can be called a locução prepositiva

So locução often sounds a bit more technical or linguistic than expressão.

You might see article omission in:

• headlines
• notes
• very compressed styles

But in normal standard Portuguese, A divulgação usa a locução sounds more complete and natural.

Portuguese generally uses articles more often than English does, especially with common nouns.

So for a full sentence, keeping both articles is the safest choice.

It follows the normal Portuguese pattern:

• Subject + Verb + Object

So:

• A divulgação = subject
• usa = verb
• a locução = object

This is the most straightforward and neutral order in Portuguese.

Yes. A passive version would be:

• A locução é usada pela divulgação.

That means The expression is used by the publicity/promotion.

Grammatically, that is fine, but it may sound less natural depending on context. Portuguese, like English, often prefers the active voice unless there is a reason to emphasize the object.

In Brazilian Portuguese, usa is pronounced roughly like OO-zah.

A useful detail: the s in usa sounds like z because it comes between vowels.

So:

• u-sa → the s becomes a z-like sound

That is very common in Portuguese.

A rough Brazilian Portuguese pronunciation is:

• jee-vool-gah-SOWN

A few important points:

• di often sounds close to jee in many Brazilian accents
• ção is a very common ending, pronounced with a nasal sound, roughly sown but nasal
• the final -ão is one of the classic Portuguese nasal endings

So the hardest part for many English speakers is the nasal -ão.

The ç is called cedilha.

It makes the c sound like s before a, o, or u.

So:

• ca = hard k sound
• ça = sa sound

In locução, the ç ensures an s sound:

• lo-cu-ção → roughly lo-koo-SOWN

Without the cedilla, the pronunciation would be different.

Nouns in Portuguese have grammatical gender, and locução is simply a feminine noun. That is why it takes:

• a locução
• not o locução

Many nouns ending in -ção are feminine:

• a informação
• a divulgação
• a comunicação
• a locução

This pattern is very useful to remember.

Yes. Like many Portuguese nouns ending in -ção, divulgação is feminine:

• a divulgação
• a apresentação
• a organização

This is one of the most reliable noun-gender patterns in Portuguese.

No. Usar normally takes a direct object, so no preposition is needed.

Examples:

• Ela usa óculos.
• Nós usamos esse método.
• A divulgação usa a locução.

So a locução is directly connected to the verb usa.

Yes, grammatically it is natural. Whether it sounds fully natural in context depends on what divulgação refers to.

For example, it could make sense in contexts like:

• marketing
• media analysis
• language analysis of an ad or campaign
• a discussion of how a publicity piece is worded

So the grammar is perfectly normal, and the vocabulary is plausible, especially in a formal or analytical context.