thrum: In Isa 38:12 the Revised Version (British and American) reads "He will cut me off from the loom," margin "thrum." "Thrum" is a technical term of weavers, denoting the threads of the warp hanging down in a loom, suiting dallah, "that which hangs down" (So 7:5, "hair"). A misinterpretation of "hanging down" is responsible for the King James' "pining sickness."
The International Standard Bible Encyclopedia
Thrum
The International Standard Bible Encyclopedia, James Orr (1915). Public domain, from the CrossWire SWORD module.