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re·bore | \ (ˌ)rē-ˈbȯr 
\
\rebored; reboring; rebores
Definition of rebore
: to bore an existing hole a second or subsequent time in order to widen it or to alter or improve its inner surfaces
After three years in the desert dust, I have just had to rebore the engine (another $1,400).— Robert Lacville To convert the 3-inch Ordnance Rifle to a breechloader, manufacturers sawed off the breech and screwed in a new steel breech … . The steel breech was rebored to 3.18 inches to attain the desired projectile size.— Mitch Meador
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Time Traveler for rebore
The first known use of rebore was circa 1792
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