Game concept
Mental Break
The game also links it as Mental Breaks.
From the game's encyclopedia
When Stress overwhelms a character they will experience a Mental Break — a personal crisis in which they feel that they must do something to lower their Stress, no matter the cost.
Characters suffering from a Mental Break will have several ways that they can deal with the situation, though many of them will have negative consequences.
At low Stress Levels these consequences are minor and easily managed. As Stress Level increases however, so do these consequences, eventually leading to insanity and even death.
The game's text for patch 1.20.1.2. Words in blue are entries of the encyclopedia: hover one to read it, as in the game.
Mental Break is an entry of Crusader Kings III's in-game encyclopedia. The game explains it: "When Stress overwhelms a character they will experience a Mental Break — a personal crisis in which they feel that they must do something to lower their Stress, no matter the cost." The game also links it as Mental Breaks. Patch 1.20.1.2, from game/common/game_concepts/00_game_concepts.txt and game/localization/english/game_concepts_l_english.yml.
Source: game/common/game_concepts/00_game_concepts.txt, game/localization/english/game_concepts_l_english.yml and the English localisation, Crusader Kings III 1.20.1.2.