to put a burrow into (a hill, mountainside, etc.).
8.
to hide (oneself), as in a burrow.
9.
to make by or as if by burrowing: We burrowed our way through the crowd.
Origin: 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
"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.