Word Origin & History
jab1825, "to thrust with a point," Scot. variant of job "to strike, pierce, thrust," from M.E. jobben "to jab, thrust, peck" (c.1490), of unknown origin, perhaps echoic. Noun meaning "a punch with the fist" is from 1889. Sense of "injection with a hypodermic needle" is from 1914.