In Country
Definition: to be operating in the physical confines of a foreign nation
Why I Looked It Up
This means what I thought it means, but I looked it up because a documentary about White colonialism implied that it was a shortened form of “Indian country.”
I couldn’t find any evidence of that, but on the Wikipedia page for that phrase, I did find this:
In the current usage the term “Indian country” is used by “soldiers, military strategists, reporters, and World Wide Web users to refer to hostile, unsecured, and dangerous territory in Iraq and Afghanistan.”