From en.wiktionary.org:
** English
*** Etymology 1
From [en].
**** Verb
[en-verb]
1. [en] To bore through an existing hole, generally to correct its shape, or to enlarge .
2. * [en]
**** Noun
[en-noun] [Bore (engine)]
1. [en] The process of modifying the bore of an engine .
2. * {{ quote-text | en | year=2005 | author=Daniel Stapleton | title=How to Plan and Build a Fast Road Car | page=14
|passage=However, any increase in capacity is useful and, if an engine is worn
and needs a REBORE, it's worth considering boring to a near maximum size
rather than simply having it bored to the next oversize.}}
*** Etymology 2
**** Verb
[en]
1. [en] [en] , generally used in the context of Christianity. < !-- Not in BNC at all, rebear is rare on Google and most hits are not the verb sense -->