v.work very hard, like a slave

同義詞：slavebreak one's backknuckle down

BUCKLE DOWN
BUCKLE DOWN
Buckle Down.
Higher expectations, leaner rations
The James Clerk Maxwell telescope Legacy Survey of the Gould Belt: a molecular line study of the Ophiuchus molecular cloud
Radiation Dose Reduction in Coronary CT?Angiography: Time to Buckle Down.
Understanding the sepsis mortality belt: time to buckle down!
Buckle Down or Dropout? The Impact of High School Exit Exams on English Language Learners
Challenges Mount: Bank Programs Buckle Down
Buckle down and press on
Time to buckle down
Top workplaces buckle down, cut loose
Buckle Down to the Shorter Period of Development by Making Quality Improvement of "Process Assurance"