The Hebrew verb duach means to rinse, wash out, or cleanse by flushing with water. It appears in contexts of ritual cleansing, particularly the washing of the inner courts or sacrificial vessels. The word implies a thorough cleansing—not just surface washing but a flushing out of impurity.
Duach appears in 2 Chronicles 4:6 describing the washing of sacrificial items in the bronze basins of the Temple. The verb captures the priestly concern for purity before approaching God. Theologically, it points to the necessity of cleansing before worship—a theme that reaches its fulfillment in the blood of Christ, which cleanses the conscience from dead works (Hebrews 9:14). The rinsing action suggests completeness: nothing unclean remains when God does the washing.