don't know what dictionary you're using TW, but the Concise Oxford has the following: 1. a water worn ravine. 2. a deep artificial channel; a gutter or drain. 3. Aus or NZ - a river valley. Oh... and of course, a cricket fielding position.
So... still plenty of room for ambiguity and artificial or natural origin. Might be best to be a bit more descriptive if using the word.
So... still plenty of room for ambiguity and artificial or natural origin. Might be best to be a bit more descriptive if using the word.