Easy as in cornerstone The primary source of power, often located at the bottom, that drives a mechanism or device. Clear All
3 Example Sentences Showcasing the Meaning of 'Mainspring'
The engineer carefully wound the mainspring of the old-fashioned music box before it played a sweet melody.
Friendship is often considered the mainspring of happiness in life.
Trust is the mainspring that keeps any relationship strong and resilient.
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