noun

• (zootomy) A breathing organ of fish and other aquatic animals.
  "Fishes […] perform their respiration under water by the gills."
• (of a fish) A gill slit or gill cover.
  "Gill nets are designed to catch a fish by the gills."
• (mycology) One of the radial folds on the underside of the cap of a mushroom, the surface of which bears the spore-producing organs.
• (animal anatomy) The fleshy flap that hangs below the beak of a fowl; a wattle.

verb

• (transitive) To catch (a fish) in a gillnet.
  "Owing to the peculiar shape of the pompano and the relatively large mesh in the pompano gill nets, the fish are not caught by being actually gilled."
• (intransitive) To be or become entangled in a gillnet.
  "Since the fine threads of the net usually are caught under the gill covers of the fish they are said to be "gilled.""

noun

• (archaic, British) A measuring jug holding a quarter or half a pint.
• (dated, US) A unit of measure equal to 4 US fluid ounces (half a cup, a quarter of a US pint), approximately 118 milliliters.

noun

• (British) A rivulet, small stream.
• (British) A ravine.