Comprehensive resource for understanding and mastering English idioms
The idiom "fill the bill" means to meet or exceed expectations, requirements, or a standard set by someone or something else. It can also mean to completely satisfy or fulfill someone's needs or requests. In modern usage, it is often used in a negative sense to indicate that someone or something has fallen short of what was expected of them.
The idiom "fill the bill" has been in use since at least the 18th century. It originates from the practice of paying a bill by filling it up with coins that meet or exceed the amount owed. The term "fill the bill" comes from the idea of filling up the bill completely and paying more than is required. Over time, the idiom has taken on a figurative meaning and is now used to describe situations where someone or something falls short of expectations.