also: とおいち
noun
illegal loan with 10% interest every 10 days
Refers to a high-interest, short-term loan often associated with loan sharks (ヤミ金融). The name comes from 十 (ten) and 一 (one), indicating 10% interest over 10 days.
トイチで金を借りると、すぐに返せなくなる。
If you borrow money at 10% interest every 10 days, you'll soon be unable to pay it back.
noun
hanafuda hand with one-point cards and one 10-point card
In hanafuda, a dealt hand consisting of 1-point cards and a single 10-point card. This is a specialized term used in the game.
See also: 手役
花札でトイチの手が来た。
I got a toichi hand in hanafuda.
Kanji spelling is possible but less common; the reading といち is standard.
Alternate reading とおいち is rare and may be encountered in older or dialectal contexts.
From 十 (ten) and 一 (one), referring to the 10% interest over 10 days. The hanafuda sense derives from the same numerical pattern: one-point cards plus one 10-point card.