firing line, on the

In the forefront of any activity or pursuit, especially a controversy. For example, At the sales conference they asked so many questions that Anne felt she was on the firing line. This expression originally meant the line of positions from which gunfire is directed at a target and is still so used in a military context. Today it is also used more loosely. [Late 1800s]

The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.