leeching
leech-ing
noun
The process of extracting soluble components from a solid material using a liquid solvent.
"Acid leaching is common in mining."
verb
Unfairly draining resources, energy, or money from a person or system.
"He's leeching off his parents for rent."
Thesaurus
Synonyms: phlebotomize, bleed, leech, phlebotomise, sponger, parasite, sponge, bloodsucker, hirudinean