打だ牌はい

Meanings

1

noun, noun or participle which takes 'suru'

discarding a tile

mahjong

Mahjong term for the action of discarding a tile from one's hand. Used as a noun or with する.

切きる
In mahjong, 切る (sense 17) is a more common verb for discarding a tile, while 打牌 is the formal noun form.

Compound of 打 (da, 'to hit' or 'to play') and 牌 (hai, 'tile'), referring to the action of playing a tile in mahjong.