Past tense of 'barrack': to house soldiers in barracks, or to loudly jeer and mock someone (primarily Australian and British English).
From Spanish 'barraca' (hut, shelter) which evolved into English 'barracks.' The jeering sense developed in Australian English during the 19th century, possibly from dialectal origins or London street slang.
Australians famously 'barrack' for their sports teams by cheering wildly and heckling opponents, and this became such a cultural trait that the term spread worldwide through sports commentary—Australian football fans literally created a new verb definition.
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