Upswing
An upswing is a period in which you win more than expected, or lose less than expected, over a number of hands. It is the opposite of a downswing.
The simple explanation
Good luck and good play together produce upswings. Players talk about an upswing in buy-ins: 'I'm up 15 buy-ins in 2,500 hands'. Such a run is rarely sustainable, because variance changes sooner or later.
A closer look
An upswing is a normal part of variance, and players should not mistake it for improved skill. Too much confidence can lead players to move up in stakes too soon or to play hands that are too loose. The best approach is to keep the same rules and bankroll plan. In the same way, accept the downswings that come with long play.
A practical example
A player wins 15 buy-ins in 2,500 hands, much more than his usual win rate. He is on an upswing.
Full explanation
An upswing is a period in which you win more than expected, or lose less than expected, over a number of hands. It is the opposite of a downswing.
An upswing is a period of winning more than average.
It is the opposite of a downswing.
Variance causes both.
Do not change your game or stakes because of a short run.
Alternative spelling: up swing, up-swing