Oust is a verb that means to remove or dispossess.
The Latin word obstare (ob STAR ay) means ‘to take away.’ From this origin we get our word of the day which means to take away someone’s position or status. For example: Don’t get me wrong, I feel Fred has been a great captain for our bowling team. But if he keeps showing up late for games, we may have to oust him from his leadership role. The way I see it, any leader who can’t be bothered to show up on time should be removed from their position.