Plural of 'handybilly,' a small portable or compact tool, device, or apparatus designed for convenience.
From 'handy' (Middle English, meaning 'easy to handle') plus 'billy' (possibly from the name Billy or a diminutive suffix); primarily Australian/British slang from the 1900s.
In Australian English, 'handybilly' is a portable winch or hand-operated pump, showing how English borrows technical jargon and transforms it into diminutive forms for everyday tools—'billy' makes mechanical things sound friendly and approachable.
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