Corpse uncleanness (Hebrew: tum'at met) is a state of ritual uncleanness described in Jewish halachic law. It is the highest grade of uncleanness, or defilement, and is contracted by having either directly or indirectly touched, carried or shifted a dead human body, or after having entered a roofed house or chamber where the corpse of a Jew is lying (conveyed by overshadowing).