sell (someone) on

: to deliver or give up in violation of duty, trust, or loyalty and especially for personal gain : betray

: to give up (property) to another for something of value (such as money)

: to offer for sale

: a deliberate deception : hoax

: the act or an instance of selling

: something to be sold or caused to be accepted

: saddle

: chiefly Scottish variant of self

: some person : somebody