[bur-oh, buhr-oh]
a hole or tunnel in the ground made by a rabbit, fox, or similar animal for habitation and refuge.
a place of retreat; shelter or refuge.
verb (used without object)
to make a hole or passage in, into, or under something.
to lodge in a burrow.
to hide.
to proceed by or as if by digging.
verb (used with object)
to put a burrow into (a hill, mountainside, etc.).
to hide (oneself), as in a burrow.
to make by or as if by burrowing: We burrowed our way through the crowd.

1325–75; Middle English borow, earlier burh, apparently gradational variant of late Middle English beri burrow, variant of earlier berg refuge, Old English gebeorg, derivative of beorgan to protect; akin to Old English burgen grave, i.e., place of protection for a body; see bury

burrower, noun
unburrowed, adjective

borough, burro, burrow.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
burrow (ˈbʌrəʊ)
1.  a hole or tunnel dug in the ground by a rabbit, fox, or other small animal, for habitation or shelter
2.  a small snug place affording shelter or retreat
vb (often foll by through)
3.  to dig (a burrow) in, through, or under (ground)
4.  to move through by or as by digging: to burrow through the forest
5.  (intr) to hide or live in a burrow
6.  (intr) to delve deeply: he burrowed into his pockets
7.  to hide (oneself)
[C13: probably a variant of borough]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

"rabbit-hole, fox-hole, etc.," c.1300, borewe, from O.E. burgh "stronghold, fortress" (see borough); influenced by bergh "hill," and berwen "to defend, take refuge." The verb is first attested 1614. Related: Burrowed; borrowing.
Online Etymology Dictionary, © 2010 Douglas Harper
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Encyclopedia Britannica


locomotion of a type found in both terrestrial and aquatic animal groups. Some fossorial animals dig short permanent burrows in which they live; others tunnel extensively and nearly continuously. In relatively soft substrates, such as soil, burrowers tend to be limbless (lizards, snakes) or equipped with powerful forelimbs (moles, badgers, mole crickets). In either group the animal's exterior is usually relatively smooth; burrowing lizards and snakes are especially smooth-scaled, and moles have short, velvety fur. The eyes of burrowing animals tend to be reduced or absent, and the ears often lack external openings.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
The eyes of moles and of some burrowing rodents are rudimentary in size, and in
  some cases are quite covered by skin and fur.
Birds to look for include nesting burrowing owls, great white egrets, great
  blue herons and a variety of waterfowl.
Closer to the ground, sage grouse, western meadowlarks and burrowing owls might
  be flushed along roads and hiking trails.
Especially when you consider preservation of various burrowing animals.
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