By Anatoly Liberman
Part 1 appeared long ago and dealt with blackguard, blackleg, and blackmail, three words whose history is unclear despite the seeming transparency of their structure. Were those guards as black as they were painted? Who had black legs, and did anyone ever receive black mail? As I then noted, the etymology of compounds may be evasive. One begins with obvious words (doormat, for example), passes by dormouse with its impenetrable first element, wonders at moonstone (does it have anything to do with the moon?), moonlighting, and moonshine (be it “foolish talk” or “illegally distilled whiskey”), experiences a temporary relief at the sight of roommate, and stops in bewilderment at mushroom. The way from dormouse to mushroom is full of pitfalls. (And shouldn’t pitfall be fallpit? Originally a pitfall was a trapdoor, a snare, a device for catching birds, but then why pit?).