Implies someone's error was not obvious and required attention to detail to be identified. The accountant was caught out after an audit revealed discrepancies.
Pro Tip 2/3
Negative Surprise
Often indicates an unpleasant surprise for the person being caught out. He was caught out when his secret emails were accidentally projected on the screen.
Pro Tip 3/3
Concealment Failure
Suggests an attempt to hide something that was eventually discovered. Despite her efforts, she was caught out sneaking in late.