exonerate       
verb [ T ]  formal uk/ɪɡˈzɒn.ə.reɪt/ us/ɪɡˈzɑː.nɚ.eɪt/
 证明…无罪;宣布…无罪;使免受责备
to show or state that someone or something is not guilty of something
  The report exonerated the crew from all responsibility for the collision. 报告证明机组人员对飞机相撞事件不负任何责任。 
 Synonyms: clear exculpate 
Opposite: convict 
Compare: acquit