jab (Noun) — A sharp hand gesture (resembling a blow). ex. "he warned me with a jab with his finger"
jab (Noun) — A quick short straight punch.
jab (Noun) — The act of touching someone suddenly with your finger or elbow. ex. "she gave me a sharp jab in the ribs"
jab (Noun) — The act of putting a liquid into the body by means of a syringe.
jab (Noun) — Taking a vaccine as a precaution against contracting a disease.
jab (Verb) — Push suddenly or strongly with a finger or something pointed. ex. "he jabbed his finger into her ribs"
jab (Verb) — Strike or punch with quick and short blows.
jab (Verb) — Stab or pierce. ex. "he jabbed the piece of meat with his pocket knife"