El esmalte rojo combina bien con tu vestido.

Because esmalte is a masculine noun in Spanish, so it takes el, not la.

• el esmalte
• un esmalte
• el esmalte rojo

This can feel surprising because English learners may associate it with nail polish, which does not have grammatical gender in English. In Spanish, you just have to learn the noun’s gender as part of the word.

In this sentence, esmalte most naturally means nail polish.

However, esmalte can also mean things like:

• enamel
• glaze
• varnish-like coating

So the exact meaning depends on context. In a sentence about clothes and colours, el esmalte rojo is very likely red nail polish.

In Spanish, adjectives usually come after the noun.

So:

• el esmalte rojo = the red nail polish
• el vestido negro = the black dress

This is the normal, neutral order in Spanish. Putting the adjective before the noun is sometimes possible, but it often changes the tone or emphasis.

Because rojo has to agree with esmalte, and esmalte is masculine singular.

Agreement in Spanish means the adjective matches the noun in:

• gender: masculine/feminine
• number: singular/plural

So:

• el esmalte rojo
• la falda roja
• los zapatos rojos
• las uñas rojas

Even if the nail polish is being worn by a woman, the adjective still agrees with esmalte, not with the person.

Combinar con is the verb pattern here, and it means to match / to go well with.

Structure:

• combinar con + noun/pronoun

Examples:

• Combina con tu vestido. = It matches your dress.
• No combina con esos zapatos. = It doesn’t go with those shoes.

The bien means well, so:

• combina bien con = goes well with / matches well with

Because combinar normally takes the preposition con in Spanish.

So you say:

• combinar con algo = to go with something

Not:

• combinar a
• combinar de
• combinar en

This is just the standard pattern you need to learn with the verb.

Tu is the informal singular word for your.

So the sentence is speaking to one person in a familiar way:

• tu vestido = your dress

If you wanted to be formal, or if your referred to you (formal), him, her, or their, you could use su:

• su vestido

In Spain, tu is used with friends, family, and people you address as tú.

Usually, vestido means dress as a piece of clothing.

In other contexts, forms of vestir can relate to dressing or clothing more generally, but as a noun, un vestido most commonly means a dress.

So in this sentence, the natural reading is definitely dress.

In normal Spanish, you usually keep the article here:

• El esmalte rojo combina bien con tu vestido.

That sounds natural because el esmalte rojo is the subject of the sentence.

Leaving out the article:

• Esmalte rojo combina bien con tu vestido

sounds unnatural in standard Spanish. Spanish uses articles more often than English does.

It describes esmalte, not vestido.

So:

• el esmalte rojo = the red nail polish
• tu vestido = your dress

If the dress were red, you would normally say something like:

• El esmalte combina bien con tu vestido rojo.

The adjective usually attaches to the noun it is next to.

Yes, in many situations you could.

• Combina bien con = sounds a bit more like matches well with
• Va bien con = sounds a bit more like goes well with

Both are natural, especially when talking about clothes, colours, and accessories.

For example:

• El esmalte rojo combina bien con tu vestido.
• El esmalte rojo va bien con tu vestido.

The first one focuses a little more on matching; the second is slightly more general and conversational.

Yes, combina is the third-person singular present tense of combinar.

The subject is el esmalte rojo, which is singular, so the verb is singular too:

• yo combino
• tú combinas
• él/ella combina
• el esmalte combina

So combina means matches / goes well with in the present.

Yes, it sounds natural in Spain.

A speaker in Spain might also say:

• El esmalte rojo te queda bien con ese vestido.
• Ese esmalte rojo combina muy bien con tu vestido.
• El pintauñas rojo combina bien con tu vestido.

A useful note: in Spain, pintauñas is also a very common everyday word for nail polish. Esmalte is correct too, and often a bit broader or slightly more neutral depending on context.