by gum

idiom

Definition of by gum

informal + old-fashioned
used to show surprise or determinationI looked it up, and by gum, she was right!By gum, I really mean it this time!

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“By gum.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/by%20gum. Accessed 8 Aug. 2020.

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