To keep doing something, especially when it is hard or takes a long time.
Examples
If you keep at your English practice, you'll see big improvements.
A: I'm finding this project really tough.
B: Just keep at it—you'll get there!
Common mistake
Not: Keep at to practise every day.
Say: Keep at it and practise every day.
'Keep at' takes an object ('keep at it'), and 'keep at it' is the usual fixed form.
More on “keep at”Another example · Tell it apart · Goes with · Tip
Another example
When I was preparing for the IELTS exam, I kept at studying every day, even when I felt tired.
Tell it apart
Keep at it.
Keep it up.
Goes with
- keep at it