Meaning

adjective affectedly modest or shy especially in a playful or provocative way

originInherited from Middle English demure, demwre, an abbreviation of Anglo-Norman de mure port (“with a mature demeanor”) (compare Old French meur from Latin mātūrus): *si il seyt coy e de mure port (Amur curteiz) (“he sits quietly and with a mature appearance”) * Documents illustrating the history of Scotland, CLV, 1306, Orders for the custody of Scottish prisoners, CLV: …et que eles soient de bon…

Etymology from Wiktionary, CC BY-SA 3.0