Water gall /(?)/

Wa·ter gall

Water gall
  1. A cavity made in the earth by a torrent of water; a washout.
  2. A watery appearance in the sky, accompanying the rainbow; a secondary or broken rainbow.
    These water galls, in her dim element, Foretell new storms to those already spent.
    False good news are [is] always produced by true good, like the water gall by the rainbow.