darning mushroom

/D AA1 R N IH0 NG M AH0 SH R UW0 M/
noun
  1. 1

    A mushroom-shaped device to darn a sock on. The sock can be stretched over the top of the (curved) mushroom, and gathered tightly around the stalk.

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Source: https://en.wiktionary.org/wiki/darning%20mushroom