One of the mysteries of the English language finally explained.
A cradle for a journal bearing, consisting of a lower part on which sits the shaft or axle in its bearing, and a cap fitting over this, which holds the shaft or axle in place and can be tightened by means of bolts as the surface of the bearing wears away; a pillow block.
Late 18th century. From a first element of uncertain origin (perhaps a surname) + block.
plummer block/ˈplʌmə ˌblɒk/
In this article we explore how to impress employers with a spot-on CV.