Agree and Shake on

Agree verb - To have or come to the same opinion or point of view.

Shake on and agree are semantically related in be in unison topic. In some cases you can use "Shake on" instead a verb "Agree".

Agree and shake on are semantically related in permit topic. Sometimes you can use "Agree" instead a verb "Shake on", if it concerns topics such as agree with some reluctance, allow participation.