Final answer:
Pride oneself on sth/ doing sth (v) means taking great pride in something or a particular action.
Step-by-step explanation:
Pride oneself on sth/ doing sth (v) can be defined as taking great pride in something or a particular action. It means having a deep sense of satisfaction and accomplishment in one's abilities or achievements in a specific area. For example, a student who excels in math may pride themselves on their problem-solving skills or a writer may pride themselves on their ability to craft engaging stories.