A knock on the wall of a coal-pit, given as a signal, or to ascertain its thickness: cf. jowl, v.1 4.
| 单词 | θ210372 |
| 释义 | society > occupation and work > industry > mining > [noun] > knock on wall of coal-mine (1) jowl1849 A knock on the wall of a coal-pit, given as a signal, or to ascertain its thickness: cf. jowl, v.1 4. |
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