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designate
designated driver
A person who stays sober during a social gathering and is responsible for safely driving others from one location to another. Since Kara never drinks alcohol, she always offers to be the designated driver for her friends.
designate someone or something as something
to choose or name someone or something as something. Alice will designate Andrew as our representative. She designated herself as the head of the committee.
a designated driver
(American) one person in a group who agrees not to drink alcohol in order to drive the other people to and from a place where they will drink alcohol Tom said he'd be the designated driver when we go out tonight.