[n] primitive multicellular marine animal whose porous body is supported by a fibrous skeletal framework; usually occurs in sessile colonies
[n] a follower who hangs around a host (without benefit to the host) in hope of gain or advantage
[n] a porous mass of interlacing fibers the forms the internal skeleton of various marine animals and usable to absorb water or any porous rubber or cellulose product similarly used
[v] gather sponges, in the ocean
[v] wipe with a sponge, so as to clean or moisten
[v] soak up with a sponge
[v] erase with a sponge; as of words on a blackboard
[v] ask for and get free; be a parasite