Definition of "burrow"

burrow

/ˈbʌɹəʊ/

noun
plural burrows
1. A tunnel or hole, often as dug by a small creature.
  Quotations
  But very soon he grew to like it, for the Boy used to talk to him, and made nice tunnels for him under the bedclothes that he said were like the burrows the real rabbits lived in.
  1921 June, Margery Williams, “The Velveteen Rabbit: Or How Toys Become Real”, in Harper’s Bazar, volume LVI, number 6 (2504 overall), New York, N.Y.: International Magazine Company
2. (mining) A heap or heaps of rubbish or refuse.
3. Obsolete form of barrow. A mound.
4. Obsolete form of borough. An incorporated town.
verb
third-person singular simple present burrows, present participle burrowing, simple past and past participle burrowed
1. (intransitive) to dig a tunnel or hole
2. (intransitive) (with adverbial of direction) to move underneath or press up against in search of safety or comfort
3. (intransitive) (with into) to investigate thoroughly