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means to be caught in the act of doing something wrong, like breaking the rules or committing a crime


Examples:
1- In a true-life scandal, a famous auction house employee was caught red-handed swapping out real paintings for fakes. This led to a massive investigation.
2- Even royals have their moments. A king was reportedly caught red-handed sneaking sweets into his room during a formal dinner—caught by none other than the queen herself!