also: リーチかける
expression, ichidan verb
declare rīchi; wager a rīchi bet
In mahjong, to declare that you are one tile away from a winning hand, placing a 1000-point bet on the table.
テンパイしたので、リーチを掛けた。
I was tenpai, so I declared rīchi.
リーチを掛けるときは、千点棒
When you declare rīchi, you place a 1000-point stick on the table.