cold turkey
noun [ U ] slang uk/ˌkəʊld ˈtɜː.ki/ us/ˌkoʊld ˈtɝː.ki/
突然戒毒（烟等）
the period of extreme suffering that comes immediately after a person has stopped taking a drug on which they depend
Six years ago she went cold turkey on (= stopped completely) a three-pack-a-day smoking habit. 6年前，她突然戒掉了一天抽3盒烟的习惯。