a dog-sled runner coated with mud.
See also: mud ((n.))
- 1938  At noon a brief halt is made for icing the runners of the sled. In the coldest weather "mud runners" are used.
- 1963  He's the one who mixes up a bucket of mud that he uses to repair the six-inch frozen-mud runners which still make the best shoeing for a dog sled in wintertime.