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To shake hands, as to indicate greeting, farewell, agreement, approval, or congratulation. It was a momentous occasion when the leaders of the two warring nations struck hands at the peace summit. What a wonderful feeling to strike hands with my old friend once again.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
To conclude a bargain or reach an agreement.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.