let nature take its course
To let events develop and conclude naturally, i.e., as they would without outside intervention, help, or interference. The phrase can refer to nature literally, or figuratively to manmade situations or events. If we were to let nature take its course and stop maintaining this lot, it would look like the rest of the forest in months. I know he's underperforming, but he doesn't report to you, so I would just let nature take its course and let his department head discover his incompetence for herself.
Farlex Dictionary of Idioms. © 2024 Farlex, Inc, all rights reserved.