Lewis & Short

impinguo (inp-), no perf., ātum, 1, v. a. and n. [in-pinguis].

  1. I. Act., to make fat (post-class.): impinguo πιαίνω, Gloss. Philox.: cui cor impinguatum, Tert. Jejun. 6.
  2. * II. Neutr., to become fat: porcellum tamdiu coques, donec lenis fiat et impinguet, Apic. 8, 7, § 375.