Is it ensure, insure, or assure?
1620s, from French feston (16c.), from Italian festone, literally "a festive ornament," apparently from festa "celebration, feast," from Vulgar Latin *festa (see feast (n.)). The verb is attested from 1789. Related: Festooned.
festoon fes·toon (fě-stōōn')
A carving in the base material of a denture that simulates the contours of the natural tissue being replaced by the denture.
in architecture and decoration, carved ornamental motif consisting of stylized flowers, fruit, foliage, and cloth, tied together with ribbons that sag in the middle and are attached at both ends. The distinction is sometimes made between a swag and a festoon by limiting the former to festoons entirely made up of folds of cloth.