Webster's English Dictionary

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jab

1. jab \'jab\ vb or jabbed;  or jab.bing [alter. of job (to strike)] 1a: to 
   pierce with or as if with a sharp object : STAB  1b: to poke quickly or 
   abruptly : THRUST  2: to strike with a short straight blow  1: to make 
   quick or abrupt thrusts with a sharp object  2: to strike a person with a 
   short straight blow 
2. jab n : an act of jabbing; specif : a short straight boxing punch delive 
   red with the leading hand