to get rid of and offer (a work of art) from a museum's collection, particularly in purchase to buy other pieces of art: "He in addition denied that ... buddies of this museum were permitted purchase ... pieces that have been deaccessioned” ( nyc days).
to sell (artwork); -- used of sales of art by museums.
to get rid of a work of art from a museum's collection and offer it.
To formally eliminate an object from a museum, art gallery or library such that it might sold.
offer (art works) from a group, especially in purchase to raise cash when it comes to acquisition of various other art works