forehead

Your forehead is the part of your face above the eyebrows. Where a thermometer goes and where worry shows.

It is the front of the skull, and English calls the whole area the brow as well. It gives us a small set of gestures: slapping your forehead at your own stupidity, mopping it in heat, and pressing it against a window. Sweat appears there first. The word is written as one word, and the older pronunciation with a silent h has largely given way to one that says both parts.