A "retention offer" is a special incentive given to an employee to encourage them to stay in the company instead of quitting or looking for another job. It is usually provided when an employee is considering leaving the organization. Full definition
You can get retention offers for much more but those higher offers are typically given to more established customers with higher spend put on their credit card. (uponarriving.com)
He maintains a list on his blog of retention offers from various reward cards, so people can see before calling what they are likely to receive. (creditcards.com)
If you've put most of your spend on one card you might have a better chance at getting one of the better retention offers for that card. (uponarriving.com)