The Collaborative International Dictionary
Jagger spring
Jagger \Jag"ger\, n. [From 4th Jag.] One who, or that which, jags; specifically:
a jagging iron used for crimping pies, cakes, etc.
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A toothed chisel. See Jag, v. t.
Jagger spring, a spring beneath a seat, and resting on cleats or blocks in the body of a vehicle.
--Knight.