Definition of crusty

The word "crusty" has an interesting etymology. The word is derived from the Old French "croust," which referred to a crust or outer layer of something, such as a loaf of bread. This Old French word is ultimately from the Latin "crustula," meaning "little crust" or "shell". In the 15th century, the word "crusty" began to be used in English to describe bread that had a crusty exterior, but was soft and fresh on the inside. Over time, the word took on a broader meaning, describing not just baked goods, but also people who were prickly or gruff on the outside, but had a softer center. Today, the word "crusty" is often used to describe someone who appears rough or gruff, but has a kind or vulnerable side.