Game concept
Unpressed Claim
The game also links it as Unpressed Claims, Unpressed.
From the game's encyclopedia
Unpressed Claims are legally tenuous, and are not inherited by the children of the Claimant.
However, Unpressed Claims become Pressed if they are used in a Casus Belli to declare War — even if the war ends in a White Peace.
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.
Unpressed Claim is an entry of Crusader Kings III's in-game encyclopedia. The game explains it: "Unpressed Claims are legally tenuous, and are not inherited by the children of the Claimant." It is part of claim. The game also links it as Unpressed Claims and Unpressed. 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.