Downswing
A prolonged losing stretch caused mainly by variance rather than bad play. Its opposite is an upswing or 'heater'. 'Running bad' and 'running good' describe the same thing from the player's point of view.
Frequently asked questions
What is a downswing in poker?
A sustained run of losses, measured in buy-ins rather than days. It is a statistical feature of the game, not evidence by itself that a player has started playing badly.
How long can a downswing last?
Longer than most players expect. A genuine winner at a modest win rate can lose over tens of thousands of hands, and tournament players can go a year without a deep run. The thinner the edge, the longer the possible stretch.
How do players handle downswings?
Bankroll management is the whole answer — enough buy-ins that a bad run cannot end the career. Beyond that: reduce stakes, review hands with someone else, and watch for the tilt that turns a normal downswing into a self-inflicted one.