"Roster turnover" refers to the process of replacing or changing the members of a team or group. It means bringing in new people while some old members leave or are replaced. Full definition
You can't have the kind of roster turnover where you lose more than 4 players twice in 6 years and expect to be consistent. (sbnation.com)
With constant roster turnover and minimum salaries with limited guarantees given out to be an 11th or 12th man, there are plenty of players who miss out on that chance to really flourish. (sbnation.com)
Players are constantly let go, there is constantly roster turnover. (sbnation.com)