Final answer:
In Don Quijote, there are words and expressions no longer used in modern Spanish, such as 'sosegar' and 'hidalgo'.
Step-by-step explanation:
In Miguel de Cervantes' novel, Don Quijote, there are several words and expressions that are no longer in use in modern Spanish. One example is "sosegar", meaning "to calm down", which is rarely used today. Another example is "hidalgo", which referred to a nobleman in the past but is now obsolete. Other words and expressions that are no longer commonly used include "a bulto", meaning "by chance", and "desaforado", meaning "uncontrolled".
Learn more about Words and expressions in Don Quijote no longer used in modern Spanish