I was walking down/on the street with a friend of mine.

[Marika33]

Does "I was walking down the street with a friend of mine" mean the same thing as "I was walking on the street with a friend of mine", or does it actually means "down the street" (the opposite of "up the street")?

 

[Piscean]

We don't say walking 'on the street' in BrE.

If the street is not on a hill then there is little difference in meaning between 'up', 'down' and 'along'.