Cleanse

Cleanse is a summoner spell that instantly removes most disabling crowd control from your champion, such as stuns, slows, and roots, and reduces the duration of new crowd control for a short window afterward. It does not remove knock-ups or suppression.

Players take Cleanse when an enemy team has lockdown that would otherwise chain them to death, letting a carry escape a stun and keep dealing damage in a fight. Holding it until the key ability lands, rather than panicking early, is the difference between a game-saving cleanse and a wasted summoner spell.