プログレッシブ和英中辞典(第4版)の解説
-だの
彼女はピアノだのフルートだのを稽古(けいこ)している
She takes lessons in piano, flute, and so forth.
忙しいだの病気だのと言ってちっとも約束を守らない
He never keeps his promises, saying he is too busy, or he is not well, or something./He keeps breaking his promises on the pretext of pressure of business, ill health or whatnot.
彼はなんだのかんだのと文句ばかりを言っている
He is always complaining about 「this and that [one thing or another].