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Phrase(s): keep one’s nose to the grindstone
Fig. to work hard and constantly. • Son: I’ll never get good grades. I might as well not even study. Mother: Don’t give up yet. I’m sure that if you just keep your nose to the grindstone, you’ll get the results you want. • Mary kept her nose to the grindstone while her friends were out enjoying themselves.
McGrawhill's American Idioms And Phrasal Verbs