Definitions for keep one's nose to the grindstone
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>.