1. make or become more light: "most of the country should brighten up later"Similarmake/become brightmake/become brighterlight uplightenthrow/cast/shed light onilluminateillumineirradiate
▪ make (something) more attractively colourful: "daffodils brighten up many gardens and parks"Similarenhanceembellishmake more attractiveenrichfreshendress upginger upadd some colour toprettifybeautifygraceinformal:jazz upzhoosh (up)