The word "quit" means to stop doing something or to leave a place or situation. It often implies a voluntary decision to discontinue an activity or to resign from a job. For example, if someone says they quit their job, it means they have decided to stop working there.
The word "quit" comes from Middle English "quiten," which means "to repay or to release." This, in turn, derives from the Old French "quiter," meaning "to free, release, or acquit." Its roots can be traced further back to the Latin "quietus," meaning "free from disturbance."