Login or register (free and only takes a few minutes) to participate in this question.
You will also have access to many other tools and opportunities designed for those who have language-related jobs (or are passionate about them). Participation is free and the site has a strict confidentiality policy.
Explanation: The person who uses this phrase has usually been talking about something very specific and ends by saying "but it's goodbye to all that" meaning that all that is now past, behind him, finished. It's all over, in the past. Maybe he is referring to his youth, maybe to recent experiences, but always in the past
Explanation: I don't think it can be classified as an idiom. The phrase means something like "I've closed the book on it. It's something that happened in the past and I am moving on."
It's also the title of the wonderful autobiography of Robert Graves, about his experiences in the trenches during WW1 in France.