brightening
bright-en-ing
noun
The process or act of becoming lighter, more cheerful, or more hopeful.
"There was a noticeable brightening in her eyes."
verb
Becoming lighter, more cheerful, or more promising in appearance or mood.
"The sky is brightening after the rain."
Thesaurus
Synonyms: lighten up, lighten, brighten, light up, clear up, clear