Comprehensive resource for understanding and mastering English idioms
The idiom "break one’s back" means to do something really hard or difficult, usually something that requires a lot of effort or labor. It can also mean to work extremely hard, often to the point of exhaustion.
The exact origin of the idiom "break one’s back" is not entirely clear, but it has been in use since at least the 16th century. One theory suggests that the phrase comes from the hard work of farmers who would often bend over their backs while working on a farm. Another theory suggests that it comes from the difficulty of carrying heavy loads or doing manual labor. Over time, the idiom has come to be used more broadly to refer to any task or activity that requires a lot of effort or labor.