playing the field

Playing the field is an idiom which has turned into a cliche from how often it is being used. When someone says they are playing the field, it means this person is dating many different people rather than just one. Their intentions for dating different people might vary, and they or may not be admitting this to each person he or she is dating. To play the field refers to having several people to date casually, or even be in relationships with each one.