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How to Say "backside" in Spanish

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trasera

trah-SEH-rah/tɾaˈseɾa/

nounB1informal
Use 'trasera' when referring to the rear or back part of a vehicle, furniture, or other inanimate object, or informally for a person's buttocks.
A storybook illustration showing the back end of a blue train car, emphasizing the rear section, which includes the coupling mechanism.

Examples

La trasera del coche tiene un rasguño.

The rear of the car has a scratch.

La trasera del camión estaba dañada.

The rear end of the truck was damaged.

Aparcó el coche muy cerca de la trasera de la casa.

He parked the car very close to the back of the house.

Necesitas más espacio en la trasera para el equipaje.

You need more space in the back for the luggage.

Gender Match

Even though it refers to a location (the back), it is always treated as a feminine noun: la trasera.

Confusing Noun/Adjective

Mistake: “Using *trasera* as an adjective with a masculine noun: *el coche trasera*.”

Correction: Use the masculine form: *el coche trasero*. Remember, *trasera* is only a noun or a feminine adjective.

posterior

/poh-steh-RYOHR//pos.teˈɾjoɾ/

nounB2polite
Use 'posterior' for a polite, anatomical reference to the buttocks or the rear part of the body, often used in medical or fitness contexts.
A simple storybook illustration of a round, fluffy orange cat sitting with its back to the viewer, showing its round rear.

Examples

Este ejercicio trabaja los músculos del posterior.

This exercise works the muscles of the glutes.

Ese ejercicio fortalece los músculos del posterior.

That exercise strengthens the muscles of the rear.

Formal vs. Informal

Learners often confuse 'trasera' and 'posterior' by using the informal 'trasera' in polite or anatomical contexts. Remember that 'posterior' is the more formal and anatomically precise term for the body's rear.

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