noun
hand of 4 and 1 in oicho-kabu
In oicho-kabu, a hand consisting of a 4 and a 1; the total is 5, which is a low score.
See also: おいちょかぶ
おいちょかぶで四一を引いてしまった。
I drew a 4-1 hand in oicho-kabu.
The card game itself; 四一 is a specific hand in that game.
From the numbers 四 (4) and 一 (1), read with a special reading しっぴん used in the context of the card game oicho-kabu.