designated driver
US /ˌdez.ɪɡ.neɪ.tɪd ˈdraɪ.vər/
UK /ˌdez.ɪɡ.neɪ.tɪd ˈdraɪ.vər/

1.
conductor designado, conductor sobrio
a person in a group who is chosen to drive everyone home safely after drinking alcohol, and who therefore does not drink any alcohol themselves
:
•
I'm the designated driver tonight, so no drinks for me.
Soy el conductor designado esta noche, así que no hay bebidas para mí.
•
They took turns being the designated driver for their group outings.
Se turnaban para ser el conductor designado en sus salidas en grupo.