Definition of upcast in English:

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upcast

noun

Pronunciation: /ˈʌpkɑːst/
(also upcast shaft) A shaft through which air leaves a mine.
Example sentences
  • Approaching demolition, various holes appeared in the brickwork of the upcast shaft allowing access to the foolhardy.
  • One of the shafts at Whinney Hill then became the upcast shaft for both collieries.
  • A new upcast shaft was sunk by Allied Constructions Pty Ltd.

verb (past and past participle upcast)

Pronunciation: /ˈʌpkɑːst/
[with object]
Cast (something) upward: (as adjective upcast) upcast light
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