( saying ) people enjoy themselves more and behave with greater freedom when the person in charge of them is not there
WHEN THE CAT'S AWAY THE MICE WILL PLAY
Meaning of WHEN THE CAT'S AWAY THE MICE WILL PLAY in English
Oxford Advanced Learner's English Dictionary. Оксфордский английский словарь для изучающик язык на продвинутом уровне. 2005