Collins Concise English Dictionary © HarperCollins Publishers::
BEF abbreviation for
  1. British Expeditionary Force, the British armies that served in France and Belgium 1914–18 and in France 1939–40
WordReference Random House Unabridged Dictionary of American English © 2020
  • before.

  • B.E.F., 
  • British Expeditionary Force;
    British Expeditionary Forces.

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