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tubbal

tubbal
  (ˈtʌbəl)
  Also tubble.
  [? dial. var. of twibill.]
  Local name of the common mattock, or of a special form (see quot. 1902); in Cornwall, a miner's tool of similar form (= tubber2).

1847–78 Halliwell, Tubble, a mattock. Devon. 1880 W. Cornwall Gloss., Tubbal, a miner's tool. 1902 Rep. Provinc. Aug. (E.D.D.), Tubbal, usually a heavy mattock, with a small axe-head, used for grubbing or rooting. Also a very common name for the common mattock.

Oxford English Dictionary

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