shake on it 握手で締める

交渉の最後を握手で締めるとき shake on it を使います。0:38 the good new is we nailed a big deal and we are traveling to Germany to shake on it.

Unfinished Business Official Trailer #1 (2015) - Vince Vaughn, Dave Franco Movie HD

https://www.youtube.com/watch?v=qoI1HYknoVs  50:51 why should I trust you now? you've got my word. will you shake on it? 何でいまさら貴様を信じるんだ？約束したからさ。じゃ確約できるのか？　
Sean Connery - The Rock (1996) Film HD [1080p]

https://www.youtube.com/watch?v=YMJZo4UeTYQ  1:23 we'll shake,,, we'll shake on this. 後でサインすると言う約束をしましょう。
Hillary Clinton's past debate moments

参考リンク
http://bridge-english.blogspot.jp/2016/09/put-ring-on-it.html  put a ring on it