turn·off / ˈtərnˌôf/ (also turn-off) • n. 1. a junction at which a road branches off from a main road: Adam missed the turnoff to the village.2. [usu. in sing.] inf. a person or thing that causes someone to feel bored, disgusted, or sexually repelled: he smelled of carbolic soap, a dreadful turnoff.3. an instance of turning or switching something off.