Meaning of sponge
Definition of 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
someone able to acquire new knowledge and skills rapidly and easily; "she soaks up foreign languages like a sponge"
primitive multicellular marine animal whose porous body is supported by a fibrous skeletal framework; usually occurs in sessile colonies
ask for and get free; be a parasite