The story
- Dutch · borrowed fromoud bruin“old brown”
- English todayoud bruin
From Dutch oud bruin (“old brown”), referring to the long aging process, up to a year.
Etymology from Wiktionary, CC BY-SA 4.0.
oud bruin
Today it means: A style of beer that undergoes a secondary fermentation, which takes several weeks to a month, and is followed by bottle aging for several more months, which allows residual yeast and bacteria to develop a sour flavor characteristic for this style. Full definition →
Dutch oud bruin