3 文書を見つけるための辞書。

• on the sly, furtively
• ひっそり, ひそかに, こっそりと
• in a furtive manner; "the soldiers were furtively crawling through the night"
• こそこそした態度で

• covertly
• こっそり, ひそかに, 内密に, 隠れて
• in a covert manner; "he did it covertly"
• ひそかな方法で

• unofficially, on the side
• ひそかに, 私的に, 非公式に
• without official authorization; "he had made some money on the side"
• 公式の認可なしで