Opening up and Open up

Open up and opening up are semantically related. in begin topic. In some cases you can use "Open up" instead a verb "Opening up", when it comes to topics like stab with pointed tool, bring up a topic, admit truth or reality of something, discharge a projectile.

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

Opening up and open up are semantically related. You can use "Opening up" instead a verb "Open up".