put one nose to grindstone

grindstone

[grahynd-stohn]
noun
1.
a rotating solid stone wheel used for sharpening, shaping, etc.
2.
a millstone.
Idioms
3.
keep/put one's nose to the grindstone, to work, study, or practice hard and steadily or to cause someone to do so: If I put my nose to the grindstone, I'll finish the job this week.

Origin:
1175–1225; Middle English. See grind, stone

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
grindstone (ˈɡraɪndˌstəʊn)
 
n
1.  a.  a machine having a circular block of stone or composite abrasive rotated for sharpening tools or grinding metal
 b.  the stone used in this machine
 c.  any stone used for sharpening; whetstone
2.  another name for millstone
3.  keep one's nose to the grindstone, have one's nose to the grindstone to work hard and perseveringly

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