chiefly British, old-fashioned + sometimes humorous
—used interjectionally to express surprise or to add emphasis
By jove, Randal, how pleasant a thing is life in London! Edward Bulwer-Lytton"By jove, Lily, you do look a stunner!" Edith Wharton… I've made up my mind to one thing, and, by Jove, I'll stick to it. Anthony TrollopeThey are not attractive … and nor are they particularly comfortable or cheap, but by Jove they work. Bryony Gordon… a setting in which one fully expects to overhear such expletives as Egad! or By Jove! or Bully! … Hudson Bridges