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English definition of “handshake”

handshake

noun [C]     /ˈhændʃeɪk/
a greeting in which two people who are facing each other take hold of each other's right hand and move it up and down: His charm begins with a warm smile, his arm on your shoulder and a firm handshake.
a business agreement made informally without signing an agreement: a handshake agreement/deal On a handshake, I've promised the first car to one of our established customers.
IT a signal sent from one computer to another to show that they are ready to send and receive information: Hackers false requests for an electronic handshake with our machines are so numerous that the legitimate requests can't get through.
(Definition of handshake noun from the Cambridge Business English Dictionary © Cambridge University Press)
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