Open up and Own up

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

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

Own up verb - To make an acknowledgment of something unpleasant as true or valid.

Open up and own up are semantically related in declare topic. You can use "Open up" instead a verb "Own up", if it concerns topics such as confess.