1) Deacquisition 1) Sell 
The sale of an item originally donated to a museum or gallery, in order to raise funds.
The sale of an item or items that were originally donated to an institution such as a museum or gallery in order to raise funds.
[v] - sell (art works) from a collection, esp. in order to raise money for the purchase of other art works
verb sell (art works) from a collection, especially in order to raise money for the purchase of other art works; `The museum deaccessioned several important works of this painter`
to sell (a work of art) from a museum's or gallery's collections, esp. with a view to acquiring funds for the purchase of other works.