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From The Collaborative International Dictionary of English v.0.48:
Jagger \Jag"ger\, n. [From 4th Jag.] One who, or that which, jags; specifically: (a) a jagging iron used for crimping pies, cakes, etc. (b) A toothed chisel. See Jag, v. t. [1913 Webster] Jagger spring, a spring beneath a seat, and resting on cleats or blocks in the body of a vehicle. --Knight. [1913 Webster]