keep at
phrasal verbPart ofkeep
keep at — phrasal verb
1. to continue working on something with effort and determination, even when it is
1.phrasal verb
Definition
to continue working on something with effort and determination, even when it is difficult
Example
Learning a new language is hard, but you just have to keep at it every day.
Aarav kept at the maths problem until he finally found the right answer.