Definitions for keep one's nose to the grindstone
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Princeton's WordNet
plug away, peg away, slog, keep one's nose to the grindstone, keep one's shoulder to the wheel(verb)
work doggedly or persistently
"She keeps plugging away at her dissertation"
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"keep one's nose to the grindstone." Definitions.net. STANDS4 LLC, 2013. Web. 18 May 2013. <http://www.definitions.net/definition/keep one's nose to the grindstone>.

