transitive. To thrust, throw, or drop into or in a liquid, penetrable substance, deep pit, container, etc.; to immerse, to submerge.

To immerse, as in a bath. To immerse in other elements or substances, e.g. sand, fire.

? To bathe, immerse.

transferred. To plunge into, to bury, imbed, involve, or include in other things.

To plunge or bathe (one's face, eyes, limbs, etc.) in water. Somewhat rare.