noun
A person chosen to stay sober and drive others home after drinking. Often used in the context of preventing drunk driving.
飲み会では、指名運転者を決めておくことが大切です。
At drinking parties, it's important to decide on a designated driver beforehand.
A more casual, loanword-based term for a designated driver, often used in everyday conversation.
Compound of 指名 (designation) and 運転者 (driver).