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.
同義詞：偷偷摸摸 on the sly.
反義詞：光明磊落 to be open and aboveboard.
up to some hangky-pangky.
hole-and-corner.
eg：the boy sneaked out his room up to some hangky-panky late in the night.
同義詞：偷偷摸摸 on the sly.
反義詞：光明磊落 to be open and aboveboard.