verb-intransitive. To drudge; to toil laboriously.n. A drudge (?).n. Any animal, vegetable, or mineral substance used in the composition of medicines.n. Any commodity that lies on hand, or is not salable; an article of slow sale, or in no demand; -- used often in the phrase “a drug on the market”.n. any stuff used in dyeing or in chemical operations.n. any substance intended for use in the treatment, prevention, diagnosis, or cure of disease, especially one listed in the official pharmacopoeia published by a national authority.n. any substance having psychological effects, such as a narcotic, stimulant, or hallucinogenic agent, especially habit-forming and addictive substances, sold or used illegallyverb-intransitive. To prescribe or administer drugs or medicines.v. To affect or season with drugs or ingredients; esp., to stupefy by a narcotic drug. Also Fig.v. To tincture with something offensive or injurious.v. To dose to excess with, or as with, drugs.