brighten

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brighten /ˈbraɪtn̩/ verb
brightens; brightened; brightening
brighten
/ˈbraɪtn̩/
verb
brightens; brightened; brightening
Learner's definition of BRIGHTEN
[+ object] : to add more light to (something)
[+ object] : to make (something) more colorful or cheerful
often + up
[no object] : to become brighter or more cheerful