I have been searching a lot for this, but can't find the expression. I'm wondering if there is a phrase that is used a lot for this.
At work, it happens a lot in many organizations that people try to do someone else's job to show off themselves and their capabilities. The motivation behind this is usually either to get a raise, or to show their boss that the current person is not doing their job well enough, and they can replace that person.
Is there a phrase or expression for this act?