No energy needed in order to reverse entropy?

how would it be possible to reverse entropy in a (closed system) without using energy. i know there's a possible way to do so? cause i know it increases and decreases in a local system. i know entropy gets its energy from the sun but, there just has to be a good lead to this . if you reverse entropy does that mean possible time reversal? please provide good info and please no negative comments. thank you.