the GNU version of the Collaborative International Dictionary of English
a. & n. from sponge, v.
The Century Dictionary and Cyclopedia
n. The act denoted by the verb ‘sponge.’
n. In curing yellow tobacco, a staining of the face side of the leaf of a dull Spanish brown, due to insufficient heat in the process of fixing the color.
Word Usage
"The other is "sponging" - in which the dolphins break off a conical bit of sponge and fit it over their heads like a cap, shielding them as they forage for food on the sea floor."