se uniera al

joined

→ se
phrase Rare #23,579
joined Subjunctive form of unirse a: to join. Often appears after expressions of hope, doubt, or emotion.
SP: Esperaba que se uniera al grupo.
EN: I hoped he would join the group.

Mary le pidió a Tom que se uniera al círculo literario.

Mary asked Tom to join the literary circle.

Tom trató de impedir que Mary se uniera al ejército.

Tom tried to prevent Mary from joining the army.

No tenemos constancia de que Taro Handa se uniera al ejército.

We have no record of Taro Handa joining the army.

— Los hombres detrás del sol 2: El laboratorio del diablo (1992)

Mary le pidió a Tom que se uniera al club de literatura.

Mary asked Tom to join the literature club.