Learn useful ways to say "swear on my" in English with drama examples and natural alternatives.

It means the speaker is making a serious promise to avoid repeating the same mistake.
From The Chauffeur, Episode 24
Someone is making a strong promise that a mistake will not happen again.
Use this when you want to sound very serious after a mistake. The 'grandmother's grave' part is dramatic and can sound too strong or melodramatic in normal conversation.
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