Affected by alcohol to the extent that normal physical and mental control is significantly impaired. It describes a state of intoxication from consuming alcoholic beverages.
From Old English 'druncen,' past participle of 'drincan' (to drink). The word originally simply meant 'having drunk,' but specialized to mean 'having drunk too much alcohol.' Related to Proto-Germanic 'drunkana' and shares roots with German 'betrunken.'
Linguistically, 'drunk' is fascinating because it's one of the few English words where the past participle of a verb ('drink-drank-drunk') became a standalone adjective describing a state of being. We literally describe the condition by referring to the completed action!
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