WordReference Random House Unabridged Dictionary of American English © 2017
friendly fire, 
  1. Business[Insurance.]a fire deliberately set and remaining contained, as in a fireplace or boiler, from which any resulting loss cannot be claimed as an insurance liability (opposed to hostile fire).
  2. Military(in military combat) fire, as by artillery, by one's own forces, esp. when causing damage near or casualties to one's own troops.

Collins Concise English Dictionary © HarperCollins Publishers::

friendly fire n
  1. firing by one's own side, esp when it harms one's own personnel

'friendly fire' also found in these entries:

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