Sentence:  Tyrion's tears contain the symbolic weight of his whole life; he wouldn't be here if not for Jaime, as he admits, and his last hope is to give the man who risked everything to help him survive the same chance. Tyrion knows it's a <WSD>death sentence</WSD> from Daenerys to betray her in this way, but he no longer cares. 
Meaning of the word marked with <WSD> tags:  A decree that someone be put to death as a punishment for a crime; a sentence of execution.