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Phrase(s): 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.
McGrawhill's American Idioms And Phrasal Verbs