Eventually, what started as tears turned into tears of blood. This was for the 'blood' (referring to a person or lineage) that could not sustain itself within the noble family.

This poignant couplet describes how a hidden sorrow or a past disgrace, something that was perhaps disowned or couldn't remain within the family's honor, eventually surfaced as tears of blood. It speaks of a profound and agonizing grief. It implies that certain painful truths or actions, even if suppressed or rejected by one's lineage, eventually manifest as immense suffering. The 'blood that couldn't stay in the lineage' signifies an unacceptable aspect or a great loss. This pain transforms into 'tears of blood,' symbolizing the most intense form of sorrow, regret, or the heavy consequences of such a past. It's a powerful image of deep, unhealable emotional wounds.