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

Examples
La acumulación de nieve cerró la carretera.
The accumulation of snow closed the road.
Debes evitar la acumulación de deudas.
You should avoid the build-up of debts.
La acumulación de basura es un problema en la ciudad.
The accumulation of trash is a problem in the city.
Identifying Gender
Most words ending in '-ción' are feminine. This means you should always use 'la' or 'una' with it, even though it doesn't end in 'a'.
Making it Plural
To make it plural, drop the accent mark on the 'o' and add '-es'. It becomes 'acumulaciones'.
Using the wrong 'the'
Mistake: “el acumulación”
Correction: la acumulación (words ending in -ción are almost always feminine).
Keeping the accent in plural
Mistake: “acumulaciones”
Correction: acumulaciones (the accent mark is only needed in the singular form to keep the stress on the last syllable).
Related Translations
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