Terms Make clean breast of and Not have are semantically related

How are the terms Make clean breast of and Not have related? Make clean breast of and Not have are antonymous, they have opposite meaning.

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Terms Make clean breast of and Not have are semantically related or have opposite meaning

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Is using breast this way, where it means chest as opposed to mammary gland or the common usage nowadays considered archaic or is it still understandable and not considered weird? It can also be understandable but still something that would make