Riding A Horse
Mounted, Equestrian
noun
A horse riding horse is what you need for riding a horse.
This is a formal word and it’s typically used at the beginning of compounds where you'll see it translated as things like mounted, as in "mounted police," or equestrian, as in “equestrian peoples.” It's working like an adjective there, but it's still a noun in Japanese.
This is a jukugo word that uses the on'yomi readings of the kanji. You should be able to read this on your own.
運動会の騎馬戦の練習があるので、明日は早起きしなくてはいけません。
I have to wake up early tomorrow morning to practice for the athletic meet’s mock cavalry battle.
「さっき馬に乗った警察官を見たよ！」「ああ、騎馬警官って言うんだよ。日本にはいないの？」
"I saw a police officer riding a horse earlier!" "Oh, you mean mounted police. Do do not have them in Japan?”
モンゴルやカザフスタンの人々は、騎馬民族として知られている。
The people of Mongolia and Kazakhstan are known as equestrian peoples.