to contact sb in order to remind them to do sth that they should have done already; to find sth that is needed; to deal with sth that has been forgotten
chase sb up
to contact sb in order to remind them to do sth that they should have done already
We need to chase up all members who have not yet paid.
chase sth up
to find sth that is needed; to deal with sth that has been forgotten
My job was to chase up late replies.
Definiciones del Oxford Advanced Learner's Dictionary, 9.ª edición