Webster's English Dictionary

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jar

1. jar \'ja:r\ vb or jarred;  or jar.ring [prob. of imit. origin] 1a: to 
   make a harsh or discordant sound  1b: to be out of harmony; specif : BICKER 
    1c: to have a harshly disagreeable or disconcerting effect  2: to undergo 
   severe vibration  : to cause to jar : as  : to affect disagreeably  : to 
   make unstable : SHAKE 
2. jar n 1a: a harsh grating sound  1b: a state or manifestation of discord 
   or conflict  2a: a sudden or unexpected shake  2b: an unsettling shock  2c: 
   an unpleasant break or conflict in rhythm, flow, or transition 
3. jar n [MF jarre, fr. OProv jarra, fr. Ar jarrah earthen water vesse]l 1: 
   a wide-mouthed container made typically of earthenware or glass  2: JARFUL 
4. jar n [alter. of char, chare] archaic  : TURN - usu. used in the phrase 
   on the jar