verb

prove that (something) is false.

he has given the Department of Transport two months to disprove the allegation

refute,prove false,show to be false,give the lie to,rebut,deny,falsify,debunk,negate,invalidate,contradict,confound,be at odds with,demolish,discredit,challenge,call into question,shoot full of holes,shoot down (in flames),blow sky-high,blow out of the water,confute,gainsay,controvert,negative