To mix up, muddle up (one thing with another); to mistake (one thing for another).
to puzzle, perplex, baffle, bewilder (somebody); to afflict by being complicated, contradictory, or otherwise difficult to understand
To mix thoroughly; to confound; to disorder.
To be confused.
To substantiate or prove the truth of something.
To affirm something formally, under oath.
To confirm or test the truth or accuracy of something.