1. (noun)sponge a porous mass of interlacing fibers that forms the internal skeleton of various marine animals and usable to absorb water or any porous rubber or celluloseproduct similarly used
2. (noun)quick study, sponge someone able to acquire new knowledge and skills rapidly and easily "she soaks up foreign languages like a sponge"
4. (noun)sponge, poriferan, parazoan primitive multicellular marineanimal whose porous body is supported by a fibrous skeletal framework; usually occurs in sessile colonies
5. (verb)sponge wipe with a sponge, so as to clean or moisten
6. (verb)mooch, bum, cadge, grub, sponge ask for and get free; be a parasite
7. (verb)sponge erase with a sponge; as of words on a blackboard