The Collaborative International Dictionary of English v.0.48:

Socome \Soc"ome\, n. [AS. s[=o]cen, s[=o]cn, searching, or the
   right of searching, the lord's court. See Soc.] (O.Eng.
   Law)
   A custom of tenants to grind corn at the lord's mill.
   --Cowell.
   [1913 Webster]