In English, across means on the other side of an imaginary line, expressing position does that means that can be either on right side or left right of the line? and they give the following example: My older sister lives just across the road, but Jenny, my baby sister, lives right across the city, 60 minutes by Tube or two hours in the car. Using the definition above, the road would be an imaginary line but how I know if the older sister lives on the right/left side of the road ?? the city would be considered as an line too? I don't understand very well this one: my baby sister, lives right across the city Could you explain this concept, please? I will be very thankful!