1. An exclamation used to express surprise, emphasis, or mild oath; a euphemistic alteration of 'by God.'
Usage: informal; chiefly Irish English; often considered stereotypical or dated

Examples

• Begorrah, that's the finest stew I've ever tasted!
• Begorrah, would you look at the size of that fish!
• Well, begorrah, I didn't expect to see you here.
• Begorrah, it's cold enough to freeze the shamrocks off a leprechaun.
• By begorrah, that was a close call!