The phrase "put behind" implies the act of moving on from something. There are various synonymous phrases and expressions that can be used in place of "put behind", depending on the context. Some examples include "let go", "move past", "move on from", "leave in the past", "leave behind", "forget about", "distance oneself from", "bury the hatchet", "turn a new page", "start fresh", "wipe the slate clean", "put in the rearview mirror", "overcome", "forgive and forget", "release the past", and "discard old baggage". Selecting the most appropriate synonym or expression depends on the intended emotion or tone.