counterbalance

counter- +‎ balance.

• (Received Pronunciation) IPA^(key): /ˌkaʊntəˈbæləns/
• (General American) IPA^(key): /ˌkaʊntɚˈbæləns/

counterbalance (plural counterbalances)

1. (literally) A weight that is put in opposition to an equal weight so it keeps that in balance.
2. (figuratively) A force or influence that balances, checks or limits an opposite one.

• counterpoise
• counterweight

counterbalance (third-person singular simple present counterbalances, present participle counterbalancing, simple past and past participle counterbalanced)

1. (transitive) To apply weight in order to balance an opposing weight.

   Big brother counterbalances his two siblings to the pound.

   • 1659 December 30 (date written)​, Robert Boyle, New Experiments Physico-Mechanicall, Touching the Spring of the Air, and Its Effects, (Made, for the Most Part, in a New Pneumatical Engine) […], Oxford, Oxfordshire: […] H[enry] Hall, printer to the University, for Tho[mas] Robinson, published 1660, OCLC 633153238:

     The remaining air was not able to counterbalance the mercurial cylinder.

   Synonyms: counterpoise, equiponderate, counterweight

   Hypernym: offset

   Antonym: outweigh

2. (transitive, figuratively) To match or equal in effect when applying opposing force

   Arm wrestling is undecided as long as the opponents counterbalance each-other

   The defenders' knowledge of the terrain roughly counterbalances the attackers' superior equipment

   • 1838 (date written)​, L[etitia] E[lizabeth] L[andon], chapter VII, in Lady Anne Granard; or, Keeping up Appearances. […], volume I, London: Henry Colburn, […], published 1842, OCLC 1000392275, page 84:

     Perhaps her views of life were too morbid, but her companions had enough cheerfulness to counterbalance any undue tinge of sadness given by one who had obviously suffered much.

   • 1859–1860, William Hamilton, H[enry] L[ongueville] Mansel and John Veitch, editors, Lectures on Metaphysics and Logic […], volume (please specify |volume=I to IV), Edinburgh; London: William Blackwood and Sons, OCLC 648725:

     The study of mind is necessary to counterbalance and correct the influence of the study of nature.

   • 1992, Rudolf M[athias] Schuster, The Hepaticae and Anthocerotae of North America: East of the Hundredth Meridian, volume V, New York, N.Y.: Columbia University Press, →ISBN, page ix:

     A considerable effort has been made in these volumes to counterbalance this activity by introducing the student to the plants as living entities with a "life of their own," as Spruce put it.

   Synonyms: counterpoise, counteract

   Antonyms: overcome, overpower