Wa·ter 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.   --Shak.
    False good news are [is] always produced by true good, like the water gall by the rainbow.   --Walpole.

 ◄ ►