noun
a gripping and shaking of right hands by two individuals, as to symbolize greeting, congratulation, agreement, or farewell
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The two business partners sealed the deal with a firm handshake.
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Let's make a bet, loser buys dinner and we seal it with a handshake.
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I knew we were going to be friends when he gave me a solid handshake.
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The agreement was merely a handshake, with no legal documents involved.