take it easy
放輕鬆；輕鬆愉快地打發時間

explanation : This is a common piece of advice, used often when saying "goodbye". To "take it easy" means to take life and its problems without feeling stressed. Don't get too upset or stressed out. You can advise someone to "take it easy" when they are headed home for the weekend. 

e.g. You had a rough week at work. Just go home and take it easy this weekend.