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Definition of re-blue in US English:
re-blue
verb
1with object To make blue again. rare.
2with object US. To give (a gun) a fresh or further treatment for rust, damage, etc., using any of various processes which result in a blue-black protective finish.
Origin
Early 17th century; earliest use found in Joshua Sylvester (d. 1618), poet and translator. From re- + blue.
