idiom
Put one's nose to the grindstone
一生懸命働き、継続的な努力に集中すること。
Meaning
To focus on hard work and continuous effort.
Example
She really had to **put her nose to the grindstone** to get the promotion.
昇進を得るために本当に鼻を研磨石に押し当てなければならなかった。