quemarse las pestañas
set phrase
1. to work very hard, to study one's brains out
studying or working very hard
- Se quemó las pestañas para aprobar el examen.He studied his brains out to pass the exam.
- Mi hermana se quema las pestañas todas las noches.My sister studies very hard every night.
- Se quemaron las pestañas para terminar el proyecto.They worked very hard to finish the project.