Mainspring
"Mainspring" in a Sentence (3 examples)
He was wise, for he had seen a long succession of mechanical toys arrive to boast and swagger, and by-and-by break their mainsprings and pass away.
My daughter is the mainspring of my life.
But in the England of Shakespeare’s history plays, the mainspring of the system has broken down.
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Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.