crankshaft
UK[ˈkræŋkʃɑːft]US[ˈkræŋkʃæft]
n
a shaft driven by or driving a crank, especially the main shaft of an internal combustion engine to which the connecting rods are attached.
Morpheme Breakdown
crank
shaft
crank
bent part
shaft
rod
Etymology
the word 'crankshaft' is a modern english compound, formed from two old english/germanic roots. 'crank' originates from a germanic root meaning 'to bend' or 'to curl', perfectly describing the bent lever that converts linear motion. 'shaft' comes from a germanic root meaning 'rod' or 'pole', denoting the long, central rotating component. when combined during the industrial revolution, these elements logically name the key engine component: a rotating shaft with one or more cranked sections to which pistons are connected, transforming reciprocating motion into rotation.
Analysis
Structure: crank (bent part) + shaft (rod)
crank: from old english cranc- (related to bending), of germanic origin; a bent arm or lever.
shaft: from old english sceaft (long, slender rod), of germanic origin; a long, straight rod or pole.
Examples
the mechanic replaced the worn crankshaft in the car's engine.
a damaged crankshaft can cause severe engine failure.
the design of the crankshaft is critical for the engine's balance and performance.