Scottish dialect: to roar, bellow, or make a loud noise like wind or water rushing.
From Scottish/Northern English dialect, possibly from Old Norse 'brúa' or imitative origin. The sound mimics rough, rushing noises.
Scottish dialect words like 'brool' often have onomatopoetic roots—the word literally sounds like what it describes, a practice so old it shows up in languages worldwide from Finnish to Mandarin.
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