Etymology
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jab (v.)

1813, "to thrust or strike with a point," a Scottish variant of job "to strike, pierce, thrust," from Middle English jobben "to jab, thrust, peck" (c. 1500), a word of unknown origin, perhaps imitative. Related: Jabbed; jabbing.

jab (n.)

1825, "a thrust or poke with the point of something," from jab (v.). Meaning "a punch with the fist" is from 1889. Sense of "injection with a hypodermic needle," once beloved by newspaper headline writers, is from 1914.

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Definitions of jab
1
jab (v.)
poke or thrust abruptly;
he jabbed his finger into her ribs
Synonyms: prod / stab / poke / dig
jab (v.)
strike or punch with quick and short blows;
jab (v.)
stab or pierce;
he jabbed the piece of meat with his pocket knife
Synonyms: stab
2
jab (n.)
a sharp hand gesture (resembling a blow);
he warned me with a jab with his finger
Synonyms: jabbing / poke / poking / thrust / thrusting
jab (n.)
a quick short straight punch;
jab (n.)
the act of touching someone suddenly with your finger or elbow;
Synonyms: dig
From wordnet.princeton.edu