line of fire

noun
  1. the straight horizontal line from the muzzle of a weapon in the direction of the axis of the bore, just prior to firing.

Origin of line of fire

First recorded in 1855–60
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for line of fire

line of fire

noun
  1. the flight path of a missile discharged or to be discharged from a firearm
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012