Webster's English Dictionary

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counterbalance

1. coun.ter.bal.ance \'kau.nt-*r-.bal-*n(t)s, .kau.nt-*r-'\ n 1: a weight 
   that balances another : COUNTERPOISE  2: a force or influence that offsets 
   or checks an opposing force 
2. counterbalance \.kau.nt-*r-', 'kau.nt-*r-.\ vt 1: to oppose with an 
   equal weight or force  2: to equip with counterbalances