Source : Webster's Revised Unabridged Dictionary (1913)

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.]
   1. To give forth a rudely quivering or tremulous sound; to
      sound harshly or discordantly; as, the notes jarred on my
      ears.

            When such strings jar, what hope of harmony ?
                                                  --Shak.

            A string may jar in the best master's hand.
                                                  --Roscommon.

   2. To act in opposition or disagreement; to clash; to
      interfere; to quarrel; to dispute.

            When those renowned noble peers Greece Through
            stubborn pride among themselves did jar. --Spenser.

            For orders and degrees Jar not with liberty, but
            well consist.                         --Milton.

Source : WordNet®

jarred
     See {jar}

jar
     n 1: a vessel (usually cylindrical) with a wide mouth and without
          handles
     2: the quantity contained in a jar; "he drank a jar of beer"
        [syn: {jarful}]
     3: a sudden impact; "the door closed with a jolt" [syn: {jolt},
         {jounce}]
     [also: {jarring}, {jarred}]

jar
     v 1: be incompatible; be or come into conflict; "These colors
          clash" [syn: {clash}, {collide}]
     2: move or cause to move with a sudden jerky motion [syn: {jolt}]
     3: shock physically; "Georgia was shaken up in the Tech game"
        [syn: {shake up}, {bump around}]
     4: affect in a disagreeable way; "This play jarred the
        audience"
     5: place in a cylindrical vessel; "jar the jam"
     [also: {jarring}, {jarred}]