godan verb (-gu), intransitive verb
become brilliant; become cheerful; brighten up
Describes a scene, atmosphere, or person's mood becoming lively, bright, and cheerful. Often used for parties, gatherings, or when someone's presence lifts the mood.
彼女が来ると、パーティーが華やいだ。
When she arrived, the party brightened up.
春になると、街全体が華やぐ。
In spring, the whole town becomes cheerful.