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training wheel noun

  /ˈtreɪnɪŋ ˌ(h)wil/ , /ˈtɹeɪnɪŋ wiːl/
  • (chiefly, Canada, US, and, in the plural, cycling) One of a pair of small wheels, each attached to one side of a bicycle's rear wheel to provide support for new riders.
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