nose to the grindstone

Nose to the grindstone is a phrase used when describing the process of continuing to work very hard without stopping. With your nose to the grindstone you are not only committing yourself to your work and refuse to give up until the job is complete, but you are working very hard, as hard as you possibly can, and will continue to work this hard continuously until it is complete. This can be physical labor or other types of work such as studying until you have finished.