Wiktionary
sell on
vb. (context transitive English) to resell.
Usage examples of "sell on".
Some junkie kicks the door in, hoping to grab a portable radio he can sell on the street for ten bucks, and hello, what have we got here?
A balance sheet was a private signal for the attorney to telephone eight nominees who would buy or sell on the stock market on Gornt's behalf, secretly, to avoid the trading being traced back to him.
So I went to the village merchant, who kept a small dry-goods store, and arranged with him to supply me with a small stock of goods, which I undertook to sell on commission for him.
Of course if I want to sell on April the fifteenth and you don't want to buy, I keep your five thousand.