the.com/lighten
To remove weight or add light, proving English never picks a lane.
means To make something less heavy, or to make it brighter, depending entirely on context.
from From Old English: leoht meaning light (the glowy kind) collided with the same word meaning light (the not-heavy kind), and the verb inherited both jobs.
Double dutyMeans brighten and unburden simultaneously.
Mood versionLighten up borrows the weight meaning emotionally.
Sky habitPre-dawn skies lighten before sunrise arrives.