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WordNet-Online 
 Definitions from WordNet
Verb buck up has 1 sense 
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| Definitions from the Webbuck upDefinition: To become encouraged or motivated; to cheer up; to gain confidence or courage Sample sentences: 
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| buck-and-wing buck-naked buck-sergeant buck-show buck-toothed buck buck fever buck private buck up buck wheat buckaroo buckbean buckbean family buckboard bucked bucked up buckel 
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