古こ馬ば

noun

older horse (4+ years); veteran racehorse

Used in horse racing contexts to refer to horses aged four or older, as opposed to younger horses (2-year-olds or 3-year-olds).

• 今年ことしの古こ馬ば戦せん線せんは混こん戦せん模も様ようだ。

  This year's older horse division is wide open.

• そのレースは古こ馬ばだけが出しゅっ走そうできる。

  Only older horses can run in that race.