high roller -> τζογαδόρος, τζογαδόρισσα, χαρτόμουτρο, λεφτάς, φραγκάτος, γλεντζές, τζογαδάρος που παίζει με χοντρά λεφτά, τζογαδάρισσα που παίζει με χοντρά λεφτά, ριψοκίνδυνος χαρτοπαίχτης, ριψοκίνδυνος χαρτοπαίκτης, ριψοκίνδυνη χαρτοπαίχτρια, ριψοκίνδυνη χαρτοπαίκτρια, σπάταλος σε πολυτελή αγαθά, κουβαρντάς, χουβαρντάς, απλοχέρης, κιμπάρης

[spiros]

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high roller -> τζογαδόρος, χαρτόμουτρο, λεφτάς, φραγκάτος, γλεντζές

high roller
a gambler who wagers large sums
one who spends lavishly and ostentatiously on entertainment

A high roller, also referred to as a whale, is a gambler who consistently wagers large amounts of money. High rollers often receive lavish "comps" from casinos to lure them onto the gambling floors, such as free private jet transfers, limousine use and use of the casinos' best suites. Casinos may also extend credit to a player to continue betting, offer rebates on betting turnover or losses, and salaries of employees may also contain incentive arrangements to bring in high rollers.
https://en.wikipedia.org/wiki/High_roller

[spiros]

high roller -> τζογαδάρος που παίζει με χοντρά λεφτά, λεφτάς, φραγκάτος

a gambler who wagers large amounts of money, usually in a casino.

[Vasilis]

He is a high roller.

high roller -> κουβαρντάς;