- turn-off (n.)
[turn-off 词源字典]
- "something that dampens one's spirits" recorded by 1971 (said to have been in use since 1968), from verbal phrase turn off "stop the flow of" (1850), from turn (v.) + off (adv.). Turn-off (n.) as "place where one road diverges from another" is from 1881.[turn-off etymology, turn-off origin, 英语词源]