Handshake

Handshake from 5th century BC, commemorating friendship of Samos (left) and Athens (right)

A handshake is when two people hold hands for a few seconds and move them up and down before letting go. It is often used like a greeting (like saying "Hello, Hi" or "goodbye" when people meet) or to say that two people have agreed on something. Handshakes are also used between romantic partners.