Definition of "grunter"

grunter

/ˈɡɹʌntə/

noun
plural grunters
1. One who grunts.
  Quotations
  Dalton, the winner of nine grand slam doubles titles, claims she would have been prepared to forfeit a match against the grunter par excellence, Maria Sharapova — and has urged the current generation of tennis players to do so.
  2007 December 19, Linda Pearce, “Tennis grunters told to stop the racket”, in The Age‎
2. Any of a group of fish of the family Terapontidae, which make a grunting sound when caught.
3. (slang) A pig.
  Quotations
  We did but keep you surety for our son, / If this be he, — or a draggled mawkin, thou, / That tends her bristled grunters in the sludge[.]
  1849, Tennyson, Poems, volume 2, page 224
  A pig fight on board ship has always amused me very much: stand on the bridge, and look down into the crowded pen of grunters […]
  1875, W. R. Ancketill, The Adventures of Mick Callighin, M.P.
4. (dated, brass founding) A hook used in lifting a crucible.