A person or animal that growls; also a container used to carry draft beer.
From growl plus agent suffix -er. The beer container meaning emerged in 19th-century America, possibly from the growling sound it made when shaken or from 'growl' meaning to complain.
The beer 'growler' became iconic—bar workers would fill these half-gallon jugs with draft beer for people to take home, and you can still buy growlers today as a retro way to transport fresh beer.
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