noun
winning off a self-drawn tile
Mahjong term: completing a hand by drawing the winning tile yourself, as opposed to claiming a discard.
from Chinese
彼は最後のツモで自摸和を決めた。
He won off a self-drawn tile on the final draw.
和了 is the general term for winning a hand, regardless of whether the winning tile is self-drawn or claimed from a discard.
From Chinese mahjong terminology; 自摸 (self-draw) + 和 (win).