The term 'sound as a bell' is often used to describe something that is perfect or of the highest quality. This phrase can be broken down into three crossword solutions: KNELL (5 letters), TOLL (4 letters), and PEAL (4 letters). A KNELL is a sound made by a bell, usually to indicate a death or a funeral. A TOLL is a sound made by a bell, usually to indicate the passing of time. A PEAL is a series of bells rung in a pattern, often to celebrate a special occasion. All three words refer to the sound of a bell, and together they form the phrase 'sound as a bell'.