1. 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see ひとのふんどしですもうをとる

Also written 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】taninnofundoshidesumouwotoru