ツモ
also: ツーモー
Meanings
drawing a tile from the wall
In mahjong, the act of drawing a tile from the wall during your turn. Often used in phrases like ツモる (to draw) or ツモ切り (discarding the drawn tile).
from Chinese zìmō
When it's your turn, you draw a tile from the wall.
winning with a self-drawn tile
Winning a hand by drawing the winning tile yourself, as opposed to claiming a discard (ロン). Often exclaimed as 「ツモ!」 when declaring a win.
Riichi, ippatsu, tsumo! (Declaring a win on the first draw after declaring riichi.)
winning off a self-drawn tile while completely concealed
Abbreviation of 門前清自摸和 (menzenchin tsumohō), a yaku (scoring combination) for winning on a self-drawn tile with a fully concealed hand (no open melds).
See also: 門前清自摸和
If you win by self-draw with a concealed hand, you get the menzenchin tsumohō yaku worth one han.