A narrow or confined space, or a variant/archaic term related to flushing or flowing water.
Obscure origin, possibly related to Old Norse or dialectal roots. Appears sporadically in historical texts, with unclear etymology; may be related to Middle Dutch 'vluch' (narrow passage).
This is one of English's ghost words—terms so obscure they barely survive in historical documents. It reminds us that not all English words had stable meanings; some were dialectal quirks that died out as regions became more connected through printing and mass communication.
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