noun
haitei winning hand; winning on the last tile drawn from the wall
A mahjong yaku: winning by drawing the very last tile from the wall. The term is a direct borrowing from Chinese mahjong terminology.
from Chinese hǎidǐ-lāoyuè
海底撈月で逆転勝利を収めた。
He pulled off a comeback victory with a haitei winning hand.
Borrowed from Chinese 海底撈月 (hǎidǐ-lāoyuè), literally 'scooping the moon from the bottom of the sea', a poetic name for this mahjong yaku.