[Anglika]

1. Does 'selling out' mean 'breaking promise'? Is it a common usage? "sell out" = to stop following your principles. Yes, fairly common.

2. What does the quote "give the heavens above more than just a passing glance" mean? Is it a common expression? Is 'passing glance' a common expression? Pay more than short attention to the world around. "Passing glance" is fairly common.

3. What does the quote "tell me who wants to look back on their youth and wonder where those years have gone" try to convey? It it a common expression? Do we really want to spend our time looking at the past and not enjoying/experiencing the present? No - not a "common expression"