Verb
shake on it (third-person singular simple present shakes on it, present participle shaking on it, simple past shook on it, past participle shaken on it)
(informal) To agree by shaking hands; to close a deal.
I'll bring the contract tomorrow, and if everything looks good, we'll shake on it.
Let's shake on it!
It's a date," Leo repeats, and we shake on it. Leo's mother sticks her head in the door. "You guys are too young to be dating!" "Mom!"Leo cries, turning bright red. Wendy Mass