machine element which constrains relative movement to the desired motion and reduces friction between moving parts
A bearing is a machine part that guides how other parts move relative to each other while reducing the friction that would otherwise wear them down. It matters because it allows machines to run more smoothly and last longer by controlling movement in specific directions and minimizing energy loss.
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A ball bearing
Discovered by embedding cosine similarity (sentence-transformers MiniLM, 384-dim).