Also, calkin.a projection on a horseshoe to prevent slipping on ice, pavement, etc.
2.
Also, calker.a similar device on the heel or sole of a shoe to prevent slipping.
verb (used with object)
3.
to provide with calks.
4.
to injure with a calk.
Origin: 1580–90; perhaps a back formation from calkin, taken as a verb calk + -in present participle suffix (Middle English -inde), confused with -ing2