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sub-level

[ suhb-lev-uhl ]
/ ˈsʌbˌlɛv əl /
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noun Mining.
a drift, dug through ore, into which overlying material, especially from an upper layer of ore, is caved.
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Which of the following nouns has an irregular plural form?
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2022

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