Scottish and Northern English dialect form meaning 'to be' or 'being'; still used in some regional speech today.
From Old English 'beon,' an archaic conjugation of the verb 'to be' that survived in Scottish and Northern English dialects rather than being replaced by 'am/is/are' like in standard English.
Most English dialects ditched old verb forms like 'bein,' but Scottish English stubbornly kept this ancient word—it's like finding a living fossil of Old English hiding in the Highlands!
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