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brighten up

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brighten up

to become brighter; to lighten, especially with sunshine. The sky is brightening up a little. When the morning sky brightens up just a little, the birds begin to sing.

See also: brighten, up

brighten up

v.

1. To become brighter or more intense in color: The sky brightened up quickly as the clouds dispersed.

2. To make something brighter or more intense in color: Some red paint will brighten up this dreary room. Put some yellow into the dye to brighten it up.

3. To become happier; improve one's mood or outlook: He brightened up after you began talking with him.

4. To make someone happier or more cheerful: The sunny weather brightened up the tired travelers. A cool glass of lemonade would brighten me up right now.

See also: brighten, up