What is "skegs"

Usage examples of "skegs".

The physical forces involved were immense, and tore open the shaft fittings and the skegs that held the entire propulsion system in place.

The boats were also without centerboards or skegs to help them track through the water, forcing the helmsmen to tug and push their steering oars as their little, deeply laden boats corkscrewed in the turbulent seas.