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From The Collaborative International Dictionary of English v.0.48:
Jeer \Jeer\, v. i. [imp. & p. p. Jeered; p. pr. & vb. n. Jeering.] [Perh. a corrup. of cheer to salute with cheers, taken in an ironical sense; or more prob. fr. D. gekscheren to jeer, lit., to shear the fool; gek a fool (see 1st Geck) + scheren to shear. See Shear, v.] To utter sarcastic or scoffing reflections; to speak with mockery or derision; to use taunting language; to scoff; as, to jeer at a speaker. [1913 Webster] But when he saw her toy and gibe and jeer. --Spenser. Syn: To sneer; scoff; flout; gibe; mock. [1913 Webster]