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 understand wrongly, taking one thing or person for another.
An error; a blunder.
A pitch which was intended to be pitched in a hard-to-hit location, but instead ends up in an easy-to-hit place.