to act against and make another (action, force) less strong

do opposing action

(to act as) a weight, force, equal to (another) and balancing it

offset an action

to take away the effect or special quality of (something) by using something with an opposite effect or quality

counteract

to balance, make up for, (something)

counterbalance, compensate

to be more in value or importance than (something)

override, dominate

to use force against (a person, thing) in order to stop her, him or it; to be undamaged or unaffected by (something); to try not to give in, not to take or use (something)

withstand, oppose

to clean (the inside of) something

cancel, revoke