Meaning of mǎ shàng:
mǎ shàng
马上
Adverb
at once; right away; immediately; on horseback (i.e. by military force)
Wǒ mǎshàng jiù lái.
我马上就来。
I will come at once.
Tā mǎshàng jiù huì dào zhèlǐ.
他马上就会到这里。
He will be here right away.
Wǒ huì mǎshàng wánchéng zhège rènwù.
我会马上完成这个任务。
I will complete this task immediately.
Tā qí zhe mǎ shàng jiē.
他骑着马上街。
He rode on horseback to the street.