プログレッシブ和英中辞典(第３版)の解説
あくゆう【悪友】
an undesirable friend; 〔総称〕bad company
- 悪友と交わる
keep bad company - 最近悪友ができたらしい
He seems to have fallen 「into bad company [in with a bad crowd] recently. - 彼は高校時代からの悪友だ((親友の意味で))
He and I have been good buddies since our high school days.