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

1.
guidatore designato, autista designato
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.
Sono il guidatore designato stasera, quindi niente bevande per me.
•
They took turns being the designated driver for their group outings.
Si alternavano a fare da guidatore designato per le loro uscite di gruppo.