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inoh

keep one's nose to the grindstone

/ˌkip wʌnz ˈnoʊz tə ðə ˈɡɹaɪndˌstoʊn/

To keep working very hard for a long time.

“If you keep your nose to the grindstone this semester, your grades will improve.”
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Illustration of keep one's nose to the grindstone: To keep working very hard for a long time.