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).

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1847–78.  Halliwell, Tubble, a mattock. Devon.

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1880.  W. Cornwall Gloss., Tubbal, miner’s tool.

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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.

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