Etymology
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bushing (n.)

"metal sleeve fitted into a machine or hole," 1839, from gerundive of bush (n.) "metal lining of the axle hole of a wheel or touch hole of a gun" (1560s), which is from Middle Dutch busse "box" (cognate with the second element in blunderbuss). Bush-metal "hard brass, gun-metal" is attested from 1847.

updated on September 09, 2017

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Definitions of bushing from WordNet

bushing (n.)
an insulating liner in an opening through which conductors pass;
bushing (n.)
a cylindrical metal lining used to reduce friction;
Synonyms: cylindrical lining
From wordnet.princeton.edu, not affiliated with etymonline.