English

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Etymology 1

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From pregrind +‎ -ing (participle ending).

Verb

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pregrinding

  1. present participle and gerund of pregrind

Etymology 2

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From pregrind +‎ -ing (gerund ending); or perhaps from pre- +‎ grinding.

Noun

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pregrinding (uncountable)

  1. The grinding of something prior to use.