on the flat

on the flat

1. (UK) On level ground.
2. On the same level, at grade.
   • 1959 November, “L.T. and E.R. developments in East London”, in Trains Illustrated, page 529:

     Another connection to be removed in September was that from the North London Line to the Tilbury route at Bromley, which crossed the District Line on the flat.

• “on the flat” (UK) in Macmillan English Dictionary.
• “on the flat” in Longman Dictionary of Contemporary English, Longman.
• “on the flat”, in Collins English Dictionary.
• “on the flat”, in Lexico, Dictionary.com; Oxford University Press, 2019–2022.