By all that's holy

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  • glamorgan

    Senior Member
    English (UK)
    It's an expression that has the form of an oath, for example: [I swear or promise] by all that's holy [i.e. sacred], that I will have my revenge on...

    So I'm swearing, or promising, on all the saints/ all their holy relics that I will have my revenge. It's a bit melodramatic...


    post mod (English Only / Latin)
    English - US
    Welcome, spirlinche. :)

    Usually, this is something someone says to emphasize that what they have just said or are about to say is true. It is like an oath: "I swear by everything that is holy that everything I say is true."

    However, we can't be certain that this is what it means where you saw it unless you give us more context. Where did you see or hear this? What was said before and after this? (You can give us up to 4 sentences, total.) What were they talking about? And so on.

    Edit: Glamorgan posted while I was writing this. We agree, it seems.
    Last edited:


    New Member
    Italian - Italy
    Doctor Stephen Maturin in "Master and Commander", watching for the first time marine iguanas in the Galapagos says " By all that's holy, I think that's unknown to science.".

    So I think what you said is absolutely correct.

    Thank you very much.

    Per aspera ad astra.
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