n.

1. 馬[C]
   I am learning to ride a horse.

   我正在學習騎馬。

2. 有腳的木架[C]
3. 【體】鞍馬；跳馬[C]
4. （總稱）騎兵[K]
   He commands 300 horse.

   他指揮三百名騎兵。

5. 【俚】海洛因[U]

vt.

1. 使……騎上馬；為……備馬
2. 【口】捉弄

vi.

1. 騎馬
2. 【口】作弄人

n.

1. a solid-hoofed plant-eating quadruped with a flowing mane and tail, domesticated for riding and as a draught animal. [Equus caballus and other species, family Equidae.]
   ▸an adult male horse, as opposed to a mare or colt.
   ▸ [treated as sing. or pl.] cavalry.
2. a frame or structure on which something is mounted or supported, especially a sawhorse.
   ▸Nautical  a horizontal bar, rail, or rope in the rigging of a sailing ship.
3. informal a unit of horsepower.
4. informal heroin.
5. Mining  an obstruction in a vein.

v.

1. provide with a horse or horses.
2. (horse around/about) informal fool about.