by God adverb 2adjective 1exclamation 1 adverb2 •Used as an oath to emphasize the veracity of an associated statement. •Used as an intensifier.I saw that map and I said right then, 'Someday I'm going to make a map of how it was that day, make a drawing of Pearl Harbor, and I'll make it right.' And I did, by God. — 1991 adjective1 •(informal) Genuine, actual.I’ll tell you one thing he was if he wasn’t no soldier. He was a by god White Cap. — 1973 exclamation1 •An exclamation of surprise.By God! That chicken has no head!
