\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.