We all know shaking hands or a handshake. There, we 'shake hands'.
There's one more gesture I do. I gently punch other's fist.
Something like this -
What do we call this gesture as a noun?
They close the deal with a handshake
The close the deal with (a?) ____________
Also, as a verb?
Whenever we meet, we shake hands
Whenever we meet, we ___________
If there's no single word, a couple would do.