Rebalancing
Periodically realigning a portfolio back to its target weights after prices drift them apart — trimming what has grown, topping up what has lagged, on a fixed rule.
Rebalancing is the disciplined act of returning a portfolio to its intended allocation. As some holdings outperform others, the mix drifts away from its target; rebalancing trims the winners and tops up the laggards to restore the plan.
Done on a fixed schedule or trigger rather than by feel, it enforces "buy low, sell high" as a rule instead of a hope, and keeps risk from quietly concentrating in whatever has run up most. It is a core mechanic of most rules-based allocations.