The story
Sivvy is a clipped corruption of asseveration.
Etymology from Wiktionary, CC BY-SA 4.0.
upon my sivvy
Today it means: Upon my soul or honour; used to underline the truth of what one is saying. Full definition →
Today it means: Upon my soul or honour; used to underline the truth of what one is saying. Full definition →
Sivvy is a clipped corruption of asseveration.
Etymology from Wiktionary, CC BY-SA 4.0.