What does it mean to kill someone in cold blood?

The idiom “cold blood” means that you kill someone without a cruel or ruthless intent. For example, the killer came up to a man while he was sleeping and killed him in cold blood. This means that the killer killed the man in a calm manner.

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It is a type of writing where you're writing about a particular subject that requires direction, instruction, or explanation it has a very different purpose and different characteristics than other writing styles such as creative writing, academic writing or business writing.

I hoped I helped :3