ustedes únanse

join, come together

→ unir
ún join; unite + an third-person plural subjunctive + se Reflexive marker
verb · 2nd-person plural formal Rare #48,044
join, come together A command addressed to a group or used formally with one person; often followed by a or al/ a la to say what to join.
SP: Únanse a nosotros en la mesa.
EN: Join us at the table.
Conjugation of unir
Imperative
SingularPlural
Second une únanse
Third una —
SingularPlural
First — unirnos

Por favor, únanse a nosotras.

Please join us.

— Juego sangriento [バトル・ロワイアル] (2000)

Ciudadanos de Gwangju, únanse?

Citizens of Gwangju, unite?

— Un Taxista (2017)

Ustedes dos, únanse.

You two, get together.

— Ne Zha (2019)

Ciudadanos, únanse.

Citizens, unite.

— Un Taxista (2017)

Al menos únanse al círculo.

At least join the circle.

— El hombre de la tierra (2007)