Definition of sell-off:
(v) :
(transitive, ditransitive, intransitive) To transfer goods or provide services in exchange for money.
(v) :
(ergative) To be sold.
(v) :
(transitive) To promote (a product or service) although not being paid in any direct way or at all.
(v) :
(transitive) To promote (a particular viewpoint).
(v) :
(transitive) To betray for money or other things.
(v) :
(transitive, slang) To trick, cheat, or manipulate someone.