Open up and Shake hands

Open up verb - Cause to open or to become open.

Shake hands and open up are semantically related. In some cases you can use "Shake hands" instead a verb "Open up".

Shake hands verb - Take someone's hands and shake them as a gesture of greeting or congratulation.

Open up and shake hands are semantically related. Sometimes you can use "Open up" instead a verb phrase "Shake hands".