"Falling over backwards" is an idiom used to describe the act of going to extreme lengths to help someone or achieve something. There are numerous synonyms that can be used to describe this action, such as "bending over backwards," "going out of one's way," or "making a huge effort." Other examples include "going the extra mile," "putting in the extra effort," or "taking a leap of faith." Regardless of the phrasing used, the meaning behind it remains the same - doing all that is possible and necessary to make something happen or to help someone else.