Gouge definition

Noun from , itself from , from Gaulish (compare Scottish Gaelic , Welsh ), from *gulbi 'beak' (compare Old Irish , Welsh , Old Breton ).

A cut or groove, as left by something sharp.

The nail left a deep gouge in the tire.
A chisel, with a curved blade, for scooping or cutting holes, channels, or grooves, in wood, stone, etc.
- 1823, James Fenimore Cooper, The Pioneers, ch. 8,
  
  The "steeple" was a little cupola, reared on the very centre of the roof, on four tall pillars of pine that were fluted with a gouge, and loaded with mouldings.

To make a mark or hole by scooping.

Japanese and Chinese printers used to gouge characters in wood.
To push, or try to push the eye (of a person) out of its socket.
- 1930, Robert E. Howard, Champ of the Forecastle,
  
  He tried to clinch and gouge, but another right hook to the jaw sent him down and out.
To charge an unreasonably or unfairly high price.

They have no competition, so they tend to gouge their customers.