buckle down
US /ˈbʌk.əl daʊn/
UK /ˈbʌk.əl daʊn/

1.
bekerja keras, bersungguh-sungguh
to start working seriously and with determination
:
•
It's time to buckle down and finish this project.
Sudah tiba masanya untuk bekerja keras dan selesaikan projek ini.
•
If you want to pass the exam, you need to buckle down and study.
Jika anda ingin lulus peperiksaan, anda perlu bekerja keras dan belajar.