intransitive verb
Definition: To continue to do something or to remain in a certain state or condition.
Example: If you want to succeed, you need to keep trying.
noun
Definition: A place where someone is kept safe or protected, often referring to a stronghold or a jail.
Example: The old castle's keep was built to protect the inhabitants from invaders.
transitive verb
Definition: To hold or maintain something in a particular state or condition, or to continue doing something over time.
Example: She decided to keep her old toys for sentimental reasons.