cold turkey 
informal
noun [mass noun]
1The abrupt and complete cessation of taking a drug to which one is addicted: I had to go cold turkey...
- Fantasy junkies know they can't go cold turkey, though.
- If you need to go cold turkey, you need to go cold turkey.
- So, I admit that those who go cold turkey may go through a rough time with withdrawals initially, but the majority are still non-smokers after one year.
1.1The unpleasant symptoms caused by suddenly ceasing to take a drug to which one is addicted: stopping the drug may result in cold turkey...
- Over six weeks he gradually reduced his intake of the new drug to nil, and then went through cold turkey as he experienced the symptoms of methadone withdrawal.
- Addicts are prescribed dihydrocodeine to make their cold turkey manageable when they're at sea, but there's also a black market for prescribed drugs here.
- But it is hugely addictive, and when you stop doing it, it is like horrendous cold turkey.
adverb chiefly North American
In a sudden and abrupt manner: I had to quit drinking cold turkey...
- ‘Last September I quit smoking and drinking cold turkey,’ said Tarr.
- After you've turned citizens into junkies, with government as the pusher, it's very hard to turn them back again, and even harder to get them to quit cold turkey.
- A network spokesperson says that doesn't mean he's quitting the news biz cold turkey.
- intracranial
- intracranially
- intractability
- intractable
- intractableness
- intractably
- intraday
- intradermal
- intradermally
- intrados
- in train
- intramolecular
- intramolecularly
- intramural
- intramurally
- intramuscular
- intramuscularly
- intranet
- intranidal
- intransigence
- intransigency
- intransigent
- intransigently
- intransitive
- intransitively