Living in London

Mind the Gap!. If I ride the tube every day, I wonder how many times I will hear this phrase during my assignment here? A million? Two? Is it a metaphor for something in my life?

It means pay attention to the gap between the bottom of the door and the tube station walkway, which could be lower or higher than the door.

The train conductor mentions it at least twice at each stop and there is a recording that plays inside the station as well, saying it over and over and over again when the train is in the station.

-LmG