counterpoise \coun"terpoise`\ koun"t?r-poiz`; 277, v. t.
   imp.  p. p. counterpoised -poizd`; p. pr.  vb. n.
   counterpoising. oe. countrepesen, counterpeisen, f.
   contrepeser. see counter, adv., and poise, v. t. 
   1. to act against with equal weight; to equal in weight; to
      balance the weight of; to counterbalance.
      1913 webster

            weights, counterpoising one another.  --sir k.
                                                  digby.
      1913 webster

   2. to act against with equal power; to balance.
      1913 webster

            so many freeholders of english will be able to beard
            and counterpoise the rest.            --spenser.
      1913 webster
see also:
counterpoised counterpoising counter poise