( saying ) if a person does not know about sth that they would normally disapprove of, then it cannot hurt them :
What does it matter if I use his flat while he's away? What the eye doesn't see ... !
( saying ) if a person does not know about sth that they would normally disapprove of, then it cannot hurt them :
What does it matter if I use his flat while he's away? What the eye doesn't see ... !
Oxford Advanced Learner's English Dictionary. Оксфордский английский словарь для изучающик язык на продвинутом уровне. 2005