riichi /ˈɹiːt͡ʃi/ noun4 •A yaku (scoring condition) and 1000-point bet made by declaring the hand to be ready, waiting for one more tile to win. •A call for such a bet. •(informal) Clipping of riichi mahjong •Being one symbol away from getting a jackpot, usually triggering an animation before the final symbol is revealed. formsriichis