(bound form) to temper metal by heating it and then dipping it into water or oil to increase hardness

to dip into water; to submerge or soak something in a liquid

(bound form) to sharpen or hone, such as a blade or one's own skills and character

(literary) to dye or stain by dipping into a liquid; to apply liquid to a surface, such as poisoning a blade

(archaic) a vessel used to hold water for extinguishing fires