What is the origin of 'sleep tight'?
Read moreOne of the mysteries of the English language finally explained.
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.
Early 17th century; earliest use found in Joshua Sylvester (d. 1618), poet and translator. From re- + blue.