line of fire

Robert B.Parkerの "Painted Ladies"を読んでいます。
"So you'll have to go someplace for a few days at least," Belson said. "I can slide you out the back way in case anyone is trying to rail you."
"If someone's trying to tail me," I said, "let's go out the front door and let him, and maybe we can catch him."
"Nobody's gonna tail us without one of us spotting the tail."
"Not possible," I said. "And if he makes a move at me, you can throw yourself into the line of fire."
"That is absolutely one of my favorite parts of police work," Belson said.

"throw yourself into the line of fire" の個所の意味を調べます。
・Oxford English Dictionary: The expected path of gunfire or a missile.: ‘residents within line of fire were evacuated from their homes’

・Collins Dictionary: If you are in the line of fire, you are in a position where someone is aiming their gun at you. If you move into their line of fire, you move into a position between them and the thing they were aiming at.
アクション小説、映画には頻出の表現でしょうね。