As far as I know "prepare" is a verb. But how is it possible to use like "code for prepare to die"? Is it incorrect grammar?
"Prepare" is a verb in this sentence. "Prepare to die" means to get ready to die. This sentence is not incorrect grammar. "Code for" in this sentence is a phrase that means a way of saying something. "Doctor's code for" means it is the doctor's way of saying something. So the whole sentence here means that it is the doctor's way of saying that he should get ready to die.
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