put nose to the grindstone

put (one's) nose to the grindstone

To work hard and diligently (on something); to put in a lot of time and effort (doing something). I'm so impressed by your grades, honey—you really put your nose to the grindstone this year, and it paid off! I've got to put my nose to the grindstone if I'm going to get this promotion.
See also: grindstone, nose, put
Farlex Dictionary of Idioms.

put one's nose to the grindstone

Fig. to keep busy doing one's work. (Also with have and get, as in the examples.) The boss told me to put my nose to the grindstone. I've had my nose to the grindstone ever since I started working here. If the other people in this office would get their noses to the grindstone, more work would get done.
See also: grindstone, nose, put
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs.

put (one's) nose to the grindstone

To work in earnest.
See also: grindstone, nose, put
American Heritage® Dictionary of the English Language, Fifth Edition.
See also:
  • put (one's) nose to the grindstone
  • put (one's) back into (something)
  • put (one's) back to (something)
  • put back to
  • put (something) in with (someone or something)
  • put (something) on the block
  • put on the block
  • put a stopper on
  • put a stopper on (something)
  • put a cap on