I've across the phrase below:
“It’s him or us!”
Could you please tell me what it exactly means?
The fuller text:
“We should kill him,” Henry says into the dark without warning, “before he kills us.” David feels the small hairs on the back of his neck stirring. It’s as if everyone has stopped breathing. He takes a deep breath and says, his voice outraged beneath the evenness, “Don’t be ridiculous, Henry—we don’t know that Ian killed anybody.” Henry says recklessly, “It’s him or us!”