bobbin

/B AA1 B AH0 N/
noun
  1. 1

    A spool or cylinder around which wire is coiled.

  2. 2

    In a sewing machine, the small spool that holds the lower thread.

    โ€œWind the bobbin, place it in the machine, and raise the thread.โ€

  3. 3

    The little rounded piece of wood at the end of a latch string, which is pulled to raise the latch.

  4. 4

    (haberdashery) A fine cord or narrow braid.

Source: https://en.wiktionary.org/wiki/bobbin