Webster's English Dictionary

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jag

1. jag \'jag\ vb or jagged;  or jag.ging [ME jaggen] chiefly dial  1: 
   PRICK, STAB  2a: to slash or pink (a garment) for ornamentation  2b: to cut 
   teeth or other indentations into  2c: to make (an edge) ragged by cutting 
   or notching  1: PRICK, THRUST  2: to move in jerks  - jag.ger n
2. jag n : a sharp projecting part : BARB 
3. jag n [origin unknown] 1: a small load  2a: a state or feeling of 
   exhilaration or intoxication usu. induced by liqu or 2b: SPREE