プログレッシブ和英中辞典(第4版)の解説
ふんどし【×褌】
a loincloth
ふんどしを締める
wear a loincloth
ふんどし１本で
naked except for one's loincloth
人の褌で相撲を取る
benefit oneself at someone else's expense; 「make a profit [get ahead] by exploiting others
褌を締めてかかる
brace oneself for an effort; roll up one's sleeves and get to work