馬上

马上
mǎshàng
  1. at once
  2. right away
  3. immediately
  4. on horseback (i.e. by military force)

CEDICT

Entry Composition

1 馬 mǎ
  1. horse
  2. horse or cavalry piece in Chinese chess
  3. knight in Western chess

classifier: 匹
2 上 shàng
  1. (bound form) up; upper; above; previous
  2. first (of multiple parts)
  3. to climb; to get onto; to go up
  4. to attend (class or university)
  5. (directional complement) up
  6. (noun suffix) on; above