Comprehensive resource for understanding and mastering English idioms
The idiom "at bottom" means to the very lowest point or level, often used to describe someone's character or actions. It can also mean to get to the root cause of a problem or issue.
The idiom "at bottom" has been used since the 14th century in English. It originally meant "to the lowest point, especially the ground," according to the Oxford English Dictionary. Over time, it evolved to mean "to the deepest level, often figuratively." The idiom may have also influenced by other phrases like "get to the bottom of" and "reach the bottom of," which both convey a similar meaning of reaching the lowest point or level.