One Answer

  1. It's a metaphor. The phraseology of this means, for example, to go unpunished in a situation where punishment cannot be avoided, or the like. In fact, getting away with it is something unrealistic, so the meaning of this phraseology is that the person about whom this is said is very, very lucky to “get off”.

    Origin unknown.

    Something like that. In Google, you can find a lot of information. Here is the first link:

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