( old-fashioned ) to treat sb/sth in a way that shows that you feel no responsibility or respect for them
PLAY FAST AND LOOSE (WITH SB/STH)
Meaning of PLAY FAST AND LOOSE (WITH SB/STH) in English
Oxford Advanced Learner's English Dictionary. Оксфордский английский словарь для изучающик язык на продвинутом уровне. 2005