Source : Webster's Revised Unabridged Dictionary (1913)

Mouse \Mouse\, v. i. [imp. & p. p. {Moused}; p. pr. & vb. n.
   {Mousing}.]
   1. To watch for and catch mice.

   2. To watch for or pursue anything in a sly manner; to pry
      about, on the lookout for something.

Mousing \Mous"ing\, a.
   Impertinently inquisitive; prying; meddlesome. ``Mousing
   saints.'' --L'Estrange.

Mousing \Mous"ing\, n.
   1. The act of hunting mice.

   2. (Naut.) A turn or lashing of spun yarn or small stuff, or
      a metallic clasp or fastening, uniting the point and shank
      of a hook to prevent its unhooking or straighening out.

   3. A ratchet movement in a loom.

   {Mousing hook}, a hook with an attachment which prevents its
      unhooking.