The phrase "dead wood" refers to people or things that are no longer useful or productive. It suggests that they are stagnant, not contributing, and holding back progress or growth. Full definition
«The probable reason for this is that plenty of dead wood remains in place even after stem wood has been removed» the insect expert explains. (sciencedaily.com)
A small company can't afford to carry dead wood on staff, so start smart by taking time to figure out your staffing needs before you even begin looking for job candidates. (entrepreneur.com)
Or would you just rather throw every player who is out of form onto the permanent dead wood pile? (justarsenal.com)