cold turkey

1. N-UNCOUNT Cold turkey is the unpleasant physical reaction that people experience when they suddenly stop taking a drug that they have become addicted to. (彻底戒毒时的)不适反应[非正式]

The quickest way to get her off the drug was to let her go cold turkey. 要使她摆脱毒品，最快的方法是彻底戒毒。