a thread used by carpenters for marking, (interchangeable 沁) to leak; to soak through
【未集上】【竹字部】䈜 ·康熙筆画：15 ·部外筆画：9
《廣韻》《集韻》𠀤七鴆切，音沁。《類篇》墨漬筆也。《廣韻》墨工人具。