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high roller is a noun meaning "one who spends lavishly and ostentatiously on entertainment". It carries 2 recorded senses.
one who spends lavishly and ostentatiously on entertainment
“the last of the big spenders”
a gambler who wagers large sums
Definitions, synonyms and semantic relations for high roller come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.