(Internet slang, especially anime and manga fandom) events or things from the past which one wants to whitewash/erase from history (due to it being embarrassing, poorly received, etc.); dark past

study of history

a female given name

a male given name

a surname

a male given name

a male given name

(obsolete) filled to capacity

a surname

(mahjong) a win worth four times of a 満貫 (mangan): 48,000 points if the winning player is on the East (dealer) side or 32,000 points otherwise