equi(equal) vocal(sound)... if we make similar sounds then it would be ambiguous(unclear) to distinguish!!
equi+vocate sounds like advocate... corrupt advocates LIE, to CONCEAL THE TRUTH which MISLEADS the judge..
equivocate = equi + vocate = equal + voice ~ambiguous
Equivovate - when someone equally -- agrees(vocate) with two pwople... he is lying
adVOCATE always MISLEAD the judge even though if he is NOT CLEAR about the case...