collect on

collect on (something)

To request or pursue something that has been offered or promised to one. Remember when you offered to watch the baby? Well, I need to collect on that now. It's time to collect on that debt he owes me.
See also: collect, on

collect on something

to take or receive payment on a debt or promise. I have come to collect on your debt. I will have to assign your account to an agency to collect on this bill.
See also: collect, on