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

1.
motorista da vez, motorista designado
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.
Eu sou o motorista da vez esta noite, então nada de bebidas para mim.
•
They took turns being the designated driver for their group outings.
Eles se revezavam para ser o motorista da vez em suas saídas em grupo.