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Related to well off: well-to-do
Having or earning enough money to live very comfortably or luxuriously. They must be pretty well off if they can afford multiple trips to Europe like that. We've been quite well off ever since my father's company was purchased by that huge corporation.
In fortunate circumstances, especially wealthy or prosperous, as in They're quite well off now. This phrase may be a shortening of come well off, that is, "emerge in good circumstances." [First half of 1600s]