sell something off—sell goods cheaply (so as to raise money quickly, etc.):
- The first “diners” were old Pullman dining cars sold off by railway companies.
sell something out—
1. sell the whole supply of smth.:
- Within twenty days the entire stock of radio sets was sold out.
2. (also: sell something up) dispose of one’s business or property (for payment of debt, etc.):
- The property had to be sold out due to the mere 10 percent return it was getting per year.
3. treacherously betray smth.:
- Public interests were sold out for personal and private profit.