noun
concealed kong; declaring a concealed kong
In mahjong, the act of forming a kong (four identical tiles) entirely from tiles in one's hand, without having called any of them from discards. The set is kept concealed until declared.
from Chinese àngàng
See also: 槓
暗槓を宣言するときは、4枚の牌を伏せて横に並べる。
When declaring a concealed kong, you place the four tiles face down in a row.
彼は手牌に同じ牌が4枚あったので、暗槓した。
He had four identical tiles in his hand, so he made a concealed kong.
From Chinese 暗槓 (àngàng), literally 'concealed kong'. The kanji 暗 means 'dark' or 'hidden', and 槓 is a mahjong-specific character for a kong (four-of-a-kind).