Open up and Usher in

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

Usher in and open up are semantically related in begin topic. In some cases you can use "Usher in" instead a verb "Open up", when it comes to topics like create.

Usher in verb - Be a precursor of.

Open up and usher in are semantically related in begin topic. Sometimes you can use "Open up" instead a verb "Usher in", if it concerns topics such as create.