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English definition of “drug”

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drug

noun [C] uk   /drʌɡ/ us  

drug noun [C] (MEDICINE)

B2 any natural or artificially made chemical that is used as a medicine: anti-cancer/fertility/pain-killing drugs a prescription drug drug therapy He takes several drugs for his condition.
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drug noun [C] (ILLEGAL SUBSTANCE)

B2 any natural or artificially made chemical that is taken for pleasure, to improve someone's performance of an activity, or because a person cannot stop using it: illegal drugs a drug addict drug addiction/abuse She began to suspect that her son was on/taking/doing drugs. She was suspected of being a drug dealer. His son died of a drug overdose. any activity that you cannot stop doing: Work is a drug for him.
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drug

verb [T] uk   /drʌɡ/ (-gg-) us  
to give a person or animal a chemical that causes him, her, or it to lose feeling or become unconscious: The killer confessed that he often drugged his victims before he killed them. She was heavily drugged to ease the pain. UK informal We visited her in hospital but she was drugged to the eyeballs (= had been given a lot of drugs) and I don't think she even knew we were there.
(Definition of drug from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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