noun

1. a hole or tunnel dug in the ground by an animal
2. any similar passage or hole for shelter, refuge, etc.

Etymology: ME burgh (see borough), infl. by bergh, hill, berwen, to defend, take refuge

intransitive verb

1. to make a burrow; dig (in, into, under, etc.)
2. to live or hide in or as in a burrow
3. to delve or search, as if by digging

transitive verb

1. to make burrows in (the ground)
2. to make by burrowing
3. to hide or shelter in or as in a burrow