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The Collaborative International Dictionary
A Plumieri

Grunt \Grunt\ (gr[u^]nt), n.

  1. A deep, guttural sound, as of a hog.

  2. (Zo["o]l.) Any one of several species of American food fishes, of the genus H[ae]mulon, allied to the snappers, as, the black grunt ( A. Plumieri), and the redmouth grunt ( H. aurolineatus), of the Southern United States; -- also applied to allied species of the genera Pomadasys, Orthopristis, and Pristopoma. Called also pigfish, squirrel fish, and grunter; -- so called from the noise it makes when taken.

  3. A U. S. infantryman; -- used especially of those fighting in the war in Vietnam. [slang]