easy money
US /ˈiːzi ˈmʌni/
UK /ˈiːzi ˈmʌni/

1.
楽な金儲け, 棚からぼた餅
money that is earned without much effort or difficulty, often through illegal or unethical means
:
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He thought selling pirated movies would be easy money, but he got caught.
彼は海賊版映画を売るのは楽な金儲けだと思っていたが、捕まった。
•
Winning the lottery is the ultimate easy money.
宝くじに当たるのは究極の楽な金儲けだ。