jigger

The origin of 'jigger' is uncertain, but it likely emerged in the 18th or early 19th century as a slang term. One prominent theory suggests it is an alteration of 'chigger,' referring to a tiny mite or flea, which metaphorically extended to mean a small mechanical contrivance or a small measure of liquor. Another possibility is that it derives from 'jig,' a lively dance, implying something that moves or is manipulated quickly. The word's journey into standard English showcases the creative, often playful, process of semantic extension in slang, where a concrete, often diminutive, reference evolves to name a specific tool or quantity.

The word 'jigger' is a simplex word. It does not break down into meaningful, reusable morphemes within the modern English spelling. It functions as a single lexical unit.