nose to the grindstone, keep one's

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keep (one's) nose to the grindstone

To work hard and/or diligently on something. Sometimes used as an imperative. I'm so impressed your grades, honey—you really kept your nose to the grindstone this year, and it paid off! I've got to keep my nose to the grindstone if I'm going to get this promotion.
See also: grindstone, keep, nose

nose to the grindstone, keep one's

Stay hard at work, as in We expect John to get good grades again, since he really keeps his nose to the grindstone. This expression, first recorded in 1539, alludes to a tool that must be sharpened by being held to a grindstone.
See also: keep, nose