箱はこ点てん

noun

having no or negative points

Mahjong term: a player's score is zero or below, often meaning they are in last place or have lost all their points.

• あのプレイヤーはもうハコテンだ。

  That player is already at zero points.

• ハコテンになると、ゲームから脱だつ落らくするルールもある。

  Some rules say you're out of the game when you hit zero points.