An aspect of a business which makes it more "defensible" from competitors, either because of the nature of its products, services, franchise or other reason
The ditch surrounding a castle, filled with water when the castle was on a stream or river, but most often just a dry ditch When wet, they did not contain alligators, but there was other revolting stuff in them
Douve A deep trench dug around a castle to impede attack from the surrounding land It could be either left dry or filled with water Water filled moats made it more difficult for attackers to dig tunnels
A trench filled with water dug around the castle It was often filled with sharp and dangerous objects like rusty metal and glass Inhabitants of the area often also threw refuse in it, contributing to the stink of the area