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The thread that is unwound from the bobbin, and is interlocked with the top thread to form a stitch.

For lace work, bobbin thread is usually wound from the same thread supply as used for the top stitches.

For most other work, the bobbin thread is hidden behind the material being decorated,  so thin, strong thread is used.  Most embroiderers use pre-wound bobbins of polyester thread, 60 weight 70 weight.