Definition of "Sponge" :

noun: primitive multicellular marine animal whose porous body is supported by a fibrous skeletal framework; usually occurs in sessile colonies

noun: a follower who hangs around a host (without benefit to the host) in hope of gain or advantage

noun: someone able to acquire new knowledge and skills rapidly and easily

"She soaks up foreign languages like a sponge."

noun: 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 cellulose product similarly used

verb: gather sponges, in the ocean

verb: wipe with a sponge, so as to clean or moisten

verb: soak up with a sponge

verb: erase with a sponge; as of words on a blackboard

verb: ask for and get free; be a parasite