The Collaborative International Dictionary of English v.0.48:

Countercheck \Coun`ter*check"\ (koun`t?r-ch?k"), v. t. [imp. &
   p. p. Counterchecked (-ch?ckt"); p. pr. & vb. n.
   Counterchecking.]
   To oppose or check by some obstacle; to check by a return
   check.
   [1913 Webster]