How to Say "to amass" in Spanish
The Spanish word for “to amass” is “acumular” — B1 level. This is a very common word in everyday Spanish.

Examples
Acumulo puntos cada vez que uso mi tarjeta de crédito.
I accumulate points every time I use my credit card.
Ella ha acumulado mucha experiencia en este trabajo.
She has amassed a lot of experience in this job.
Es peligroso dejar que se acumule el gas en la cocina.
It is dangerous to let gas build up in the kitchen.
It's completely regular
This verb follows the standard pattern for all -ar verbs. If you know how to conjugate 'hablar', you know how to conjugate 'acumular'.
Self-accumulating (Reflexive)
When things pile up on their own (like work or dust), we often add 'se' to the end: 'El trabajo se acumula' (The work is piling up).
Accumulating vs. Saving
Mistake: “Acumulo dinero para comprar una casa.”
Correction: Ahorro dinero para comprar una casa. Use 'ahorrar' for saving money intentionally; use 'acumular' for things building up in quantity.
Related Translations
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