follow-onsale
nounUK /ˈfɒləʊ ɒn seɪl/
US /ˈfɑːloʊ ɑːn seɪl/
A follow-on sale is when someone buys something else after they already bought something.
The shop made a follow-on sale when the customer bought a case for her new phone.
OTHER MEANINGS
2. A second sale of shares offered after an earlier sale.
The company announced a follow-on sale of stock to raise more money.
3. An extra purchase made because of an earlier one.
The follow-on sale of printer ink came right after the printer purchase.
4. A later sale of a product to the same buyer.
Good service often leads to a follow-on sale months later.