noun
come-from-behind horse; closer
Horse racing term for a horse that runs from behind and makes a late charge in the final stretch.
あの差し馬は最後の直線で一気に抜け出した。
That come-from-behind horse broke away in the final straight.
彼は差し馬に賭けるのが好きだ。
He likes to bet on closers.
Compound of 差し (sashi, 'thrusting forward' or 'inserting', the continuative form of 差す) and 馬 (uma, 'horse'). The term describes a horse that inserts itself into contention from behind.