Source : Webster's Revised Unabridged Dictionary (1913)

Overpoise \O`ver*poise"\, v. t.
   To outweigh; to overbalance. [R.] --Sir T. Browne.

Overpoise \O"ver*poise`\, n.
   Preponderant weight; a counterbalance. [R.] --Mrs. Browning.