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The Vein

Scholars have said that if one dreams of undergoing phlebotomy (bloodletting) from a vein crosswise, it might indicate the death of a close relative, akin to the status of that vein. It could also signify the dreamer themselves being cut off from their relatives by death if the dream's interpretation suggests misfortune or calamity. If the interpretation is unfavorable, it might point to a separation between them, possibly without death. It was also said that the knee symbolizes a man's toil and effort in his livelihood and pursuits.

Per Ibn Sirin's Muntakhab al-Kalam fi Tafsir al-Ahlam