Green About The Gills Meaning

(idiomatic) Ill or unwell, especially as indicated by one's appearance.

Example: 1899, Arthur Conan Doyle, A Duet, ch. 6:
  "You're looking rather green about the gills, old chap."
  "I feel a little chippy to-day."
  "That's the worst of these cheap champagnes."
2007 Feb. 25, Christopher Elliott, "Strategies to Make More Passengers Maiden Voyagers," New York Times (retrieved 15 Sept 2013):
  Although he boarded his ship with wristbands and pills intended to ward off any possible queasiness, he did not turn green about the gills.