What eyebrows are for
Writing about a CNN interview in which Ron Paul objected to a reporter's questions, the National Journal reports that the Republican candidate “furrowed his eyebrows.”
The idiomatic expression is to “furrow the brow”—that is, to wrinkle the forehead in perplexity. It’s a buried metaphor, furrow being a shallow trench dug in the ground by a plow and thus analogous to a wrinkle.
Brow derives from the Old English bru, or “eyebrow,” and came to mean the forehead in Middle English. It can still have the sense of “eyebrow” in the phrase “raise the brows.” The eyebrows can be raised to indicate surprise or disbelief—and the ability raise one eyebrow is handy to indicate ironic amusement.
But wrinkling the eyebrows? Don’t think so.
The writer, Adam Clark Estes of The Atlantic Wire, also describes Mr. Paul as “storming off.” But if you watch the actual video clip, all you see is the candidate, sounding a little testy but not shouting, fumble to remove the lapel microphone—not even leaving the room.
You might furrow your own brow over such reportage.