"decoration of a surface with an applied paper cut-out," by 1957, from French découpage, literally "the act of cutting out," from decouper "to cut out" (12c., Old French decoper), from dé- "out" (see de-) + couper "to cut" (see chop (v.1)).
decorative
decorator
decorous
decorticate
decorum
decoupage
decouple
decoy
decrease
decree
decrement