COMMON If someone or something fits the bill, they are exactly the right person or thing for a particular situation. I wanted someone who really knew their way around film-making and I knew that Richard would fit the bill. Finding somewhere peaceful to paint was their main priority when it came to finding a home — and their 17th-century house on a remote hillside certainly fits the bill. `Tea? Coffee?' — `Coffee would just fill the bill.' Note: The `bill' in this expression is a public notice advertising something such as a show or a play.