1.VerbTo bore through an existing hole, generally to correct its shape, or to enlarge.
"If you want to keep using that rifle, you'll have to rebore the barrel.; The cylinders of your engine are so worn the rings don't seal any more; you have to have it rebored to stop it from burning oil."
2.NounThe process of modifying the bore of an engine.
3.Verbsimple past and past participle of rebear, generally used in the context of Christianity.
"And on that day the Lord rebore me and I was reborn."