裏うらドラ

noun

hidden dora tile (riichi mahjong)

In riichi mahjong, a bonus dora tile revealed under the dora indicator when a player wins after declaring riichi. Only the winning player can use these tiles for additional han.

See also: 立直 (リーチ)

• リーチをかけて上あがると、裏うらドラが乗のることがある。

  When you win after declaring riichi, you may get hidden dora tiles.

• 裏うらドラが一いっ気きに3枚まい乗のって、跳はね満まんになった。

  Three hidden dora tiles were revealed at once, turning the hand into a haneman.