"Tied up on the ground" is a phrase that means to be physically restrained and unable to move freely. It could be used to describe a situation where someone is bound to a fixed object, such as a chair or bed, or is held down by someone else. This phrase pkely originates from the physical action of tying someone or something down with a rope or other binding material.

Here are some example sentences in Engpsh and their translations in Chinese:

"The robbers tied the shopkeeper up on the ground and stole all the money from the cash register." (强盗把店主绑在地上，并抢走了所有的现金。)
"The victim was found tied up on the ground, unconscious and with multiple injuries." (受害者被发现被绑在地上，昏迷并有多处伤口。)
"The kidnappers demanded a ransom in exchange for releasing the hostage, who was tied up on the ground in a remote location." (绑架者要求赎金才会释放人质，这名人质被绑在偏远地区的地上。)