leech >> liːtʃ
Definition: [noun] an aquatic or terrestrial annelid worm with suckers at both ends. Many species are bloodsucking parasites, especially of vertebrates, and others are predators.
Definition: [noun] a person who extorts profit from or sponges on others.
Example: they are leeches feeding off the hard-working majority
Definition: [verb] habitually exploit or rely on.
Example: he's leeching off the abilities of others