|dekə|läzh, |dāk- noun
( -s )
Etymology: French décalage action of putting out of alignment, displacement, removal of a wedge, from décaler to put out of alignment, shift, remove a wedge from (from dé- de- — from Old French des- — + caler to wedge, chock, from cale wedge, from German keil, from Old High German kīl ) + -age — more at chine
: the difference between the angles of incidence of the two wings of a biplane that is positive if the incidence of the upper wing is greater than that of the lower