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It means that someone was caught in the act of doing something.

When a murderer has killed someone, there is probably blood on his hands. Blood is red. When the criminal is caught, the blood is still on his hands.

This expression now merely means to be caught in the act of something. Its original meaning is to be caught after having stabbed someone, with their blood still on one's hands.

it means "caught in the act." For example, say a boy was sneaking in to the kitchen to steal some cookies. Well right as he puts his hand in the jar, his mother walks in the kitchen only to discover the act her son is committing. The mother "caught her son red-handed."

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12y ago

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