Horse racing — the sport of racing horses to determine ranking; often connected with betting (purchasing race tickets).
週末に競馬場へ行って、初めて馬券を買った。
I went to the racetrack on the weekend and bought a betting ticket for the first time.
競馬の予想をテレビで見ながら楽しんだ。
I enjoyed watching horse-racing predictions on TV.
その馬は競馬で何度も優勝している。
That horse has won many times in horse races.