We found one dictionary that defines the word brightens up:

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1. brightens up: Wiktionary

▸ Words similar to brightens up ▸ Usage examples for brightens up ▸ Idioms related to brightens up ▸ Wikipedia articles (New!) ▸ Words that often appear near brightens up ▸ Rhymes of brightens up ▸ Invented words related to brightens up