/boosh"ing/ , n.
1. Elect. a lining for a hole, intended to insulate and protect from abrasion one or more conductors that pass through it.
2. Mach.
a. a replaceable thin tube or sleeve, usually of bronze, mounted in a case or housing as a bearing.
b. a replaceable hardened steel tube used as a guide for various tools or parts, as a drill or valve rod.
[ 1785-95; BUSH 2 + -ING 1 ]