cold turkey
cold turkey {adv.}, {slang}, {informal}
1. Abruptly and without medical aid to withdraw from the use of an addictive drug or from a serious drinking problem.
Joe is a very brave guy; he kicked the habit cold turkey.
2. {n.}
An instance of withdrawal from drugs, alcohol, or cigarette smoking.
Joe did a cold turkey.
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Source: A Dictionary of American Idioms