letch

noun3

1. •
   (informal) A lecher.
2. •
   A stream or pool in boggy land.

   • The Letch near Killingworth Village flows in two branches: the Longbenton Letch and the Forest Hall Letch.
3. •
   (no longer used) Strong desire; passion.

   • Some people have a letch for unmasking impostors, or for avenging the wrongs of others. — 1830