Adele in her song says
Before the world fell at our feet
What does it mean?
Adele is talking about a time before she became successful and admired.
have the world at your feet
to be extremely successful and admired by a large number of people
It's a metaphor where the world simply means lots of people. A variation of the above phrase is to have the world fall at your feet. Think of adoring people, prostrated in front of you: