A small measuring cup used for pouring precise amounts of alcohol, or a small hook device used in fishing.
Possibly from 'jig' (a quick dance or movement), suggesting quick, small movements. The measuring cup sense emerged in bartending in the 19th century.
Bartenders use jiggers to measure drinks with the same precision that chemists use beakers—a 1.5 oz jigger pour is so standardized that bars worldwide use the same tool, making cocktails consistent everywhere.
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