Let's play a quick game of Call My Bluff. Here are two definitions of Crowf, you decide which is correct.
1. Crowf - a mythical creature that measured distances to places by laying down and flipping itself over and over until it arrived at the destination. The root of the phrase "as the crowf lies".
2. Crowf - a word unwittingly invented by Mark Kermode who misheard the phrase "as the crow flies".