I came across some collocations in a story. Will you explain some difficult moments?
1. “Under the immense starred roof people were walking past like threats of colour being woven into grey web”
Does “roof” in this sentence mean sky? A story takes place in the street near the Grand Central Station. Or it means the ceiling of the station?
2. What does “take a chance on” mean in this context? Please, see the photo.
3. A woman in this story says: “ I’ve got two boys with uncle Uncle Sam so I didn’t mind to oblige you”.
Does anybody use “to have somebody with Uncle Sam”, meaning someone is in the Army, nowadays?