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Phrase(s): Set a beggar on horseback, and he’ll ride to the devil.
Prov. If a poor person becomes wealthy, he or she will quickly become corrupt. • Jill: Since Phil inherited all that money, all he does is go to parties and take drugs. Jane: Yep. Set a beggar on horseback, and he’ll ride to the devil.
McGrawhill's American Idioms And Phrasal Verbs