他人のふんどしで相撲を取る、他人の褌で相撲を取る
たにんのふんどしですもうをとる
tanin'nofundoshidesumouwotoru
JMdict entry #2790780
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expressions (phrases, clauses, etc.)Godan verb with 'ru' ending
to profit at someone else's expense; to rob Peter to pay Paul; to take risks with other people's money
see: 人のふんどしで相撲を取る・ひとのふんどしですもうをとる