to puzzle, perplex, baffle, bewilder (somebody); to afflict by being complicated, contradictory, or otherwise difficult to understand
To mix up, muddle up (one thing with another); to mistake (one thing for another).
To mix thoroughly; to confound; to disorder.
To be confused.
To make plain, manifest, or intelligible; to clear of obscurity; to illustrate the meaning of.
To give a valid excuse for past behavior.
To make something plain or intelligible.