[transitive] (vetoes, vetoing, vetoed, vetoed) to stop sth from happening or being done by using your official authority (= by using your veto) 否决◆The takeover was vetoed by the European Commission.这项收购遭到欧盟委员会的否决。to refuse to accept or do what sb has suggested拒绝◆The union vetoed the introduction of six-month contracts.工会拒绝采用六个月的合同。