1. To work very hard to accomplish something for someone
bend over backwards to help someone
To 'bend over backwards' means to make every effort to do something and to go out of your way to ensure something is done well or someone is taken care of. Bending over backwards is an uncomfortable position so 'to bend over backwards' implies sacrificing your own comfort in order to accomplish something. This is an idiomatic expression used in social and professional contexts. Similar meaning expressions include 'go out of my way' and 'go the extra mile'.