to say that (something) is not true

disagree, renounce, decline

to prove (something) to be wrong or false

prove false

to show that (a person, statement, act etc) is right, reasonable or proper

legitimize, substantiate

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

prove false; discredit

to drive (a person, thing) back or away; to cause (a person) to feel dislike

push away; repulse