中英成语俚语800对178：鬼鬼祟祟
鬼鬼祟祟
up to some hangky-pangky.
hole-and-corner.
eg：the boy sneaked out his room up to some hangky-panky late in the night.
同义词：偷偷摸摸 on the sly.
反义词：光明磊落 to be open and aboveboard.