411 REFERENCE · Wiktionary
God's truth
Reference material by Wiktionary contributors. This retains its source identity and is not 411 news reporting.
English
Noun
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The absolute truth; used as an emphatic asseveration that one is not lying.
Interjection
en colloquial A mild oath expressing surprise or generally adding emphasis.
en 1933 w:Frank Clune Try Anything Once (book) Try Anything Once Sydney Angus and Robertson 186 ‘God’s truth!’ he said. ‘I don’t know how. I always leave that to my accountant.’