counterbalance

A weight that is put in opposition to an equal weight so it keeps that in balance.

A force or influence that balances, checks or limits an opposite one.

To apply weight in order to balance an opposing weight.

Big brother counterbalances his two siblings to the pound.

[…] the remaining Air was not able to counterballance the Mercurial Cylinder, […]

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.