exculpate - definition and synonyms

verb [transitive] very formal 

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/ˈekskʌlpeɪt/
present tense
I/you/we/theyexculpate
he/she/itexculpates
present participleexculpating
past tenseexculpated
past participleexculpated
  1. to prove that someone is not guilty of a crime or other bad action