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From The Collaborative International Dictionary of English v.0.48:
Jar \Jar\, v. i. [imp. & p. p. Jarred; p. pr. & vb. n. Jarring.] [Cf. OE. charken to creak, AS. cearcian to gnash, F. jars a gander, L. garrire to chatter, prate, OHG. kerran to chatter, croak, G. quarren to grumble, and E. jargon, ajar.] [1913 Webster] 1. To give forth a rudely quivering or tremulous sound; to sound harshly or discordantly; as, the notes jarred on my ears. [1913 Webster] When such strings jar, what hope of harmony ? --Shak. [1913 Webster] A string may jar in the best master's hand. --Roscommon. [1913 Webster] 2. To act in opposition or disagreement; to clash; to interfere; to quarrel; to dispute. [1913 Webster] When those renowned noble peers Greece Through stubborn pride among themselves did jar. --Spenser. [1913 Webster] For orders and degrees Jar not with liberty, but well consist. --Milton. [1913 Webster]