Originally posted by tkamiya
Well, do you go up a street or do you go down a street? Is it up town or down town? Do you lock up a car or do you lock down a car?
'Up' a street is towards uptown, or uphill if it applies. Conversely for 'down'. 'Lock up' is what you normally do to secure your vehicle. 'Lock down' is what your vehicle does if your security has the 'trap-the-perp' option.