坊主丸儲け

ぼうずまるもうけ

expression

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monks make pure profit, monks need no capital and have no expenses, so their income is pure profit

坊	boy, priest's residence, priest
主	lord, chief, master, main thing, principal
丸	round, full (month), perfection, -ship, pills, make round, roll up, curl up, seduce, explain away
儲	be profitable, yield profit