How to Say "to merge" in Spanish
The most common Spanish word for “to merge” is “unir” — use 'unir' when referring to the act of joining or connecting two or more separate entities, like companies or organizations, into a single one..
unir
/oo-NEER//uˈniɾ/

Examples
La fusión permitirá unir las dos empresas en una sola entidad.
The merger will allow the two companies to be united into a single entity.
Decidimos unirnos a la causa de la limpieza de playas.
We decided to join the beach cleanup cause.
Las dos empresas rivales se unieron para formar una más grande.
The two rival companies merged to form a larger one.
¿Te vas a unir a nosotros para el almuerzo?
Are you going to join us for lunch?
The Reflexive 'Se'
When 'unir' is used with the pronoun 'se' (unirse), it means the subject is doing the action to itself or that multiple subjects are acting together to become one, like 'The companies merged' (Las empresas se unieron).
Forgetting the Reflexive Pronoun
Mistake: “Ellos unen para luchar. (They join to fight.)”
Correction: Ellos se unen para luchar. (They join up/come together to fight.) Use 'se' when they are joining *themselves* to the group.
unirse
/oo-NEER-seh//uˈniɾse/

Examples
Es importante que los ciudadanos se unan para defender sus derechos.
It is important for citizens to unite to defend their rights.
Es crucial que todos los vecinos se unan para limpiar el parque.
It is crucial that all the neighbors unite to clean the park.
Las dos empresas se unieron el año pasado.
The two companies merged last year.
The Meaning of Plural Reflexive
When used with 'nosotros' (we) or 'ellos' (they), 'unirse' often describes a reciprocal action—they are uniting with each other.
Unir vs. Unirse: Action vs. Joining
Related Translations
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