Longman Dictionary of Contemporary English homepage

grindstone

 noun
     
Related topics: Technology, Tools
grind‧stone [countable]
TTZ a large round stone that turns like a wheel, and is used for making tools and knives sharp when they are rubbed against it

➔ keep your nose to the grindstone

at nose1 (11)
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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