the.com/jab

The punch that does the boring work so the knockout gets the credit.

means A short, sharp punch thrown straight out with minimal windup, used to probe, distract, or soften up an opponent rather than end the fight.

from Jab is likely imitative in spirit — a short, clipped word for a short, clipped action. It surfaces in English dialect in the 1800s meaning to poke or stab roughly, probably related to 'job' in its older sense of 'to peck or prod,' as a bird might jab at something with its beak. Boxing adopted it in the 19th century for that quick, straight-arm poke, and the word's stubby one-syllable punch mirrors the punch itself.

boxing role
fastest punch, shortest range, sets up everything else
etymology
19th century slang for a quick poke or stab
vaccine slang
british shorthand for an injection, needle included
muhammad ali
used his jab to measure distance before destroying opponents
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