Phrasal Verb: Chase up

Meaning: Ensure that someone remembers to do something

Example: The librarian is CHASING me UP about my overdue books.

Meaning: Try to get someone to pay a bill, debt, etc

Example: I CHASED her UP as she hadn't paid for several months.

Meaning: Try to get more information about the progress of something

Example: I didn't get a reply so I have been CHASING them UP.