GILL

(ORGAN) [noun] [C usually plural] - the organ through which fish and other water creatures breatheSee picture: Fish(humorous) If someone is described as green/pale about the gills, it means that they are looking ill and pale.(informal) To the gills means completely.By the time the fourth course was served I was full/stuffed to the gills (= could not eat any more food).The restaurant was packed to the gills