Archaic/slang: to make something bright or lively; often used with 'up' (gay up).
Definitions
To make bright, lively, or showy; to adorn or enliven (often with up). They gayed up the stage with colorful banners.
Archaic usage; functions as an adverb meaning “gaily, cheerfully.”
Definitions
Archaically: in a cheerful or light-hearted manner; gaily. The children skipped gay along the village lane.