/ˈbʌrəʊ/
[noun] A hole or tunnel dug in the ground by an animal, such as a rabbit or fox, used as a place to live or hide. It can also be used as a verb meaning to dig or push through something.
A burrow and a borough are secret cousins — both are places of shelter and protection, sharing the same ancient root.
The word 'burrow' stretches back to the Old English word 'beorg', meaning a hill, mound, or fortified place. This ancient root carried a powerful idea at its heart: a place of safety, somewhere raised or enclosed that offered protection from the world outside. The same root gave rise to the Old English 'burg' or 'burh', a fortified settlement or town — which is exactly where the modern word 'borough' comes from, as well as the '-burg' and '-bury' endings you see in place names like Canterbury and Edinburgh.
The Proto-Germanic ancestor behind all of these was '*bergaz', meaning a hill or mountain, and it was connected to the idea of covering or hiding — to shelter beneath something solid. This same Germanic root flowed into Old High German as 'berg' (mountain), into Old Norse as 'bjarg' (rock, cliff), and survives today in modern German 'Berg', still meaning mountain. When you look at a burrow — that neat tunnel pressed into the earth — you can still feel that ancient logic: a small mountain of soil piled around a hidden, safe interior.
In Middle English, the word shifted in form to 'borwe' and 'borgh', and its meaning began to narrow. While 'borough' kept the grand, civic sense of a protected settlement, the humbler word 'burrow' was left to describe the small, underground shelters made by animals. This split happened gradually during the 13th and 14th centuries, as English was absorbing enormous pressure from Norman French and Latin, and many Old English words quietly divided into two — one for public life, one for the natural world.
The verb 'to burrow', meaning to dig or tunnel through the earth, followed naturally from the noun. By the 16th century, writers were using it to describe animals pressing themselves into the soil, and soon after it began to be used figuratively — to burrow through a pile of books, to burrow under the covers on a cold morning. This metaphorical life has proven remarkably durable. Today we use 'burrow' without thinking about its urban, fortified origins, yet the sense of seeking shelter and safety inside something solid remains perfectly intact.
It is worth pausing on the quiet poetry of this family of words. A rabbit's burrow, a medieval borough, a Scottish 'brae' (hillside, from the same Norse branch), and the '-berg' in an iceberg — all of them are cousins, all sharing that original Proto-Germanic image of a solid, protective rise in the landscape. Language, like the animal itself, tunnels through time, carrying old meanings into new contexts, and what looks like a simple word for a hole in the ground turns out to be a small monument to the human need for safety and shelter.