Moderate as in keynote/keystone The primary source of power, often located at the bottom, that drives a mechanism or device. Clear All
5 Example Sentences Showcasing the Meaning of 'Mainspring'
Students were amazed to discover the mainspring of the antique clock during their history museum visit.
As the hiker reached the summit, he felt a burst of energy, akin to a mainspring propelling him forward.
With a gentle pull of the lever, the magician revealed the hidden compartment powered by a concealed mainspring.
Learning about the scientific method is the mainspring of any student's journey into the world of research and experimentation.
The protagonist's quest for justice served as the mainspring, propelling the gripping storyline of the detective novel.
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