Source : Webster's Revised Unabridged Dictionary (1913)

Shoaling \Shoal"ing\, a.
   Becoming shallow gradually. ``A shoaling estuary.'' --Lyell.

Shoal \Shoal\, v. i. [imp. & p. p. {Shoaled}; p. pr. & vb. n.
   {Shoaling}.]
   To assemble in a multitude; to throng; as, the fishes shoaled
   about the place. --Chapman.