to become brighter, happier, or more lively, or to make something like that
to make something lighter or happier
2 meanings, ordered from most common to least. Color-coded by CEFR level.
to become brighter with more light or colour, or to make something brighter
"A few yellow cushions will brighten up the living room."
The weather had brightened up a bit by the afternoon.
— BBC News weather reports, common broadcast phrasing
to become happier or more cheerful, or to make someone feel happier
"She brightened up when she heard her brother was coming home."
Her face brightened up.
— Common narrative phrasing in English fiction; no single secure citation recalled
Very common in everyday English for weather, rooms, faces, mood, and appearance. In the command 'Brighten up!' it can sound a little sharp.
Natural word combinations native speakers use most often.
The five tense forms you'll use most often.
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