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have been sponging

  • present perfect progressive
    of sponge.
    sponge
    noun
    any aquatic, chiefly marine animal of the phylum Porifera, having a porous structure and usually a horny, siliceous or calcareous internal skeleton or framework, occurring in large, sessile colonies.

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Well, after all, you have been sponging off them for a full year.

From The Cords of Vanity A Comedy of Shirking by James Branch Cabell