buckle down

US /ˈbʌk.əl daʊn/
UK /ˈbʌk.əl daʊn/
"buckle down" picture
1.

se dedicar, se empenhar

to start working seriously and with determination

:
It's time to buckle down and finish this project.
É hora de se dedicar e terminar este projeto.
If you want to pass the exam, you need to buckle down and study.
Se você quer passar no exame, precisa se dedicar e estudar.