to put an end to (a law, an old custom, war etc.)

away with or put an end to

to destroy (a group, community) completely

destroy completely

to cause (a marriage agreements, a law etc) to exist no longer

void an agreement

to deny the truth of (something said or written, a person who has given a decision etc)

be at variance with

to act in opposition to( a low, a custom)

go against, contradict

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

do opposing action

an offer (of a price) made in reply to an earlier offer

take back; cancel

to say that (something) is not true

disagree, renounce, decline

to say that one does not own for have a connection with (a person, thing, action etc)

deny

to prove (something) to be wrong or false

prove false

to rub or scrape out (something)

remove; rub out

to prevent (a person) from doing something; to prevent (plans) from being carried out

thwart, disappoint

to make (a written agreement, guarantee etc) not valid

render null and void

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 decide against (a person, decision etc) (especially by using one's higher authority)

repeal

to prove (a person, statement, opinion etc) to be wrong or mistaken

prove false; discredit

to cancel, end (a decree, consent, permission etc)

take back; cancel

to clean (the inside of) something

cancel, revoke