- (Britain, idiomatic, dated) A good person, someone to be trusted; a friend.
1942, The Texas Outlook, volume 26, page 42:
- Tom speaks: "I have a girl friend I want you to meet. She's a good egg."
1952, James Thomas Farrell, A Hell of a Good Time, page 49:
- Johnny Parker is in town. I like Johnny. He's a big shot in pictures and he's a good egg.
2017 August 13, Brandon Nowalk, “Oldtown Offers One Last Game-changing Secret as Game Of Thrones Goes behind Enemy Lines (Newbies)”, in The A.V. Club, archived from the original on 4 December 2017:
- Drogon sniffs Jon [Snow]—and Dany [Daenerys Targaryen] apparently doesn't care enough about Jon's life to get off Drogon so she can witness their interaction on the other side of his fat neck and make sure her son isn't eating his cousin—and seems to sense he's a good egg at the least and quite possibly that he's a Targaryen.