Senhora, use um pincel pequeno junto ao rodapé, para não sujar a parede.

Senhora means madam or ma’am and is a polite way to address an adult woman.

Here it is being used in direct address, like saying:

• Madam, use a small brush...

In European Portuguese, this gives the sentence a formal, respectful tone. It also helps explain why the verb form is formal.

Because this sentence is using the formal command.

In European Portuguese:

• usa = command for tu (informal singular)
• use = command for você / o senhor / a senhora (formal singular)

Since the sentence begins with Senhora, the speaker is addressing the woman politely, so use is the correct imperative form.

It comes from the verb usar, meaning to use.

So:

• usar = to use
• use = use! / please use! (formal command)

In this sentence, use is telling the person what to do.

Pincel means brush, especially a paintbrush or a brush used for applying paint carefully.

That is different from words like:

• escova = a brush more like a scrubbing brush, hairbrush, etc.

Because the sentence mentions a parede and o rodapé, pincel clearly refers to a paintbrush.

In Portuguese, adjectives often come after the noun.

So:

• um pincel pequeno = a small brush

That is the most normal, neutral order.

You can sometimes place adjectives before the noun, but that is less common and may sound more literary, emphatic, or stylistically marked. For everyday instruction, um pincel pequeno is the natural choice.

Literally:

• junto a = next to / close to
• o rodapé = the skirting board / baseboard

So junto ao rodapé means:

• next to the skirting board
• along the baseboard area
• close to the skirting board

In context, it tells you where to use the small brush.

Because a + o contracts to ao in Portuguese.

So:

• junto a o rodapé → junto ao rodapé

This is a very common contraction.

Other similar contractions are:

• a + a = à
• de + o = do
• em + o = no

So junto ao rodapé is just the correct contracted form.

Rodapé is the strip at the bottom of an interior wall where the wall meets the floor.

In British English, this is usually skirting board. In American English, it is usually baseboard.

So in painting instructions, junto ao rodapé refers to the area near that lower trim.

The comma separates the main instruction from the purpose clause:

• Use um pincel pequeno junto ao rodapé
• para não sujar a parede

The second part explains why: so as not to dirty the wall.

In Portuguese, this comma is often used to make the sentence easier to read, especially in instructions. In some cases, you may also see similar sentences written without that comma. So this is more about punctuation style and clarity than a major grammatical rule.

This is a purpose structure:

• para = in order to / so that
• não = not
• sujar = to dirty / to make dirty

So:

• para não sujar = in order not to dirty / so as not to get ... dirty

After para, Portuguese often uses the infinitive when the subject is understood from context.

Here, the idea is:

• Use a small brush near the baseboard so that you do not dirty the wall.

Because não negates the verb that follows it.

So:

• sujar = to dirty
• não sujar = not to dirty

This is the normal order in Portuguese. When using para + infinitive, the negative goes before the infinitive:

• para fazer = in order to do
• para não fazer = in order not to do

Sujar means to make dirty, to soil, or to get something dirty.

In this sentence, it means not getting paint onto the wall accidentally.

It is similar to manchar, but not exactly the same:

• sujar = to dirty, soil, mess up
• manchar = to stain, mark, leave a stain

When painting, both could make sense in some contexts, but sujar a parede is very natural for saying make the wall dirty with paint.

Portuguese uses definite articles more often than English.

So where English might say:

• don’t dirty the wall

Portuguese says:

• não sujar a parede

Using a here is completely normal and natural. In many cases, Portuguese prefers the where English might omit it or use a slightly different structure.

Yes, it fits European Portuguese very well, especially because of the formal address:

• Senhora
• use

That said, the sentence would also be understandable in Brazilian Portuguese. The main thing that feels especially European here is the polite, instructional tone and the use of Senhora in this kind of context.

Yes. In context, several English translations are possible, such as:

• next to the skirting board
• near the skirting board
• along the skirting board

The exact English choice depends on how natural you want it to sound. Portuguese junto a often covers that general idea of closeness or contact with something nearby.

Grammatically, it is a command in the imperative, but in tone it is a polite instruction.

Because it uses:

• Senhora
• the formal command use

it sounds respectful rather than harsh. So in real-life terms, it feels like someone giving careful instructions, for example during painting or decorating.