DuckCorp Dico

Found one definition

1.                 From The Collaborative International Dictionary of English v.0.48:
                   
   
   
                   
                     
   Rut \Rut\, v. i. [imp. & p. p. Rutted; p. pr. & vb. n.
      Rutting.]
      To have a strong sexual impulse at the reproductive period;
      -- said of deer, cattle, etc.
      [1913 Webster]