an act of shaking sb's hand, used especially to say hello or goodbye or when you have made an agreement 握手◆Everything was agreed on a handshake. 一切在握手之後都商定了。
handshake deal/agreementa deal which has been agreed in a conversation or an email, although there is not yet a formal written agreement 口头协议◆He is determined to get them to stick to their handshake deal. 他决心让他们履行其口头协议。