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Definition of Buoy up
1. Verb. Become more cheerful. "After a glass of wine, he lightened up a bit"
2. Verb. Make more cheerful. "The conversation lightened me up a bit"
Exact synonyms: Lighten, Lighten Up
Generic synonyms: Cheer
Causes: Lighten, Lighten Up
Antonyms: Weigh Down
Generic synonyms: Cheer
Causes: Lighten, Lighten Up
Antonyms: Weigh Down
3. Verb. Keep afloat. "The life vest buoyed him up"