跟进 (gēn jìn): to follow; to follow up

After sending the quotation email, I followed up with a phone call the next day; the client said they needed a week to think it over.

The doctor suggested I come back next week for a follow-up check to monitor my blood sugar control.

After the project started, the manager asked me to follow up on the progress every day to make sure each stage was completed on time.

I complained to the courier company; they promised to follow up on the issue, but a week later there was still no reply.

As a customer service representative, I have to follow up on dozens of orders every day to make sure customers' problems are solved promptly.