A variant spelling of 'downby'; downward and to the side in location or direction (Scottish dialect).
An alternative spelling of 'downby' using 'bye' instead of 'by'; reflects how Scottish and dialectal words have variable spellings before standardization.
The fact that 'downby' and 'downbye' are the same word with different spellings tells us something important—before dictionaries standardized English, people spelled phonetically based on their accents! Scottish communities still use these location words naturally in speech.
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