光明磊落
to be open and aboveboard.
as clear as crystal.
eg:a gentleman' s activities are open and aboveboard.
中英俚语俗语来源:晋书:"大丈夫行为,当磊磊落落,如日月胶然。"
同义词:胸怀坦荡 as open as the day.
反义词:鬼鬼祟祟 up to some hangky-pangky.