grasping and shaking a person's hand (as to acknowledge an introduction or to agree on a contract)
"After years of negotiations, the two CEOs finally sealed their deal with a firm handshake."
The grasping of hands by two people when greeting, leave-taking, or making an agreement.
"The business deal was sealed not with a contract but with a firm handshake between the two partners."
To perform a handshake; to shake hands.
"They exchanged a firm handshake before shaking off the cold and heading inside for coffee."