Definition of sell (someone) on
- He tried to sell them on the project.
- She wasn't sold on the idea.
: 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
: chiefly Scottish variant of self
: some person : somebody
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