keep one’s nose to the grindstone

(verb) to continue to work extremely hard

Example Sentences:

A: How is school going? Are you still studying Engineering?
B: Yeah, but it’s so hard! I study for hours every day!
A: Well, just keep your nose to the grindstone. If you keep working hard, you’ll be successful one day!

The young football player is keeping his nose to the grindstone by practicing every day, so he can play professionally one day.

A: You look great! How did you lose so much weight?
B: Well, I kept my nose to the grindstone and worked out every day.
A: Fantastic!

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