Small metal fasteners like bolts, screws, and hinges used to hold things together; or side dishes that accompany a main meal.
From fixing (gerund of fix) plus -s plural. Originally mechanical terminology, later adopted in cooking contexts.
The word 'fixings' for side dishes is a Southernism that shows how regional English dialects preserve older meanings—it comes from the 1800s when 'fixing' meant 'preparing' or 'putting together,' which is exactly what side dishes do for a meal.
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