1) metallic tube or lining. without moving parts. to reduce friction between mechanical parts such as a pulley sheave and an axle; also the nonrotating sheave used to increase the bend radius for the sling attachment (contrast with bearing). 2) a device. often made of rubber or plastic. to reduce vibration or wear between mechanical parts. 3) a fitting used to connect plumbing parts of different diameters (such as in spray equipment).

Merriam-Webster Online Dictionary
bushing (noun)
a usually removable cylindrical lining for an opening (as of a mechanical part) used to limit the size of the opening, resist abrasion, or serve as a guide
an electrically insulating lining for a hole to protect a through conductor
bushing (Wikipedia)

Bushing may refer to:

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