lightens
light-ens
verb
Makes or becomes less heavy or burdensome.
"Sharing tasks lightens the workload."
verb
Makes or becomes less serious or more cheerful.
"Good news lightens her mood."
verb
Makes or becomes less dark or brighter in colour.
"The morning sky lightens gradually."
Thesaurus
Synonyms: lighten up, brighten, buoy up, relieve
Antonyms: darken, weigh down, weigh on