burn the midnight oil
US /bɜːrn ðə ˈmɪd.naɪt ˌɔɪl/
UK /bɜːrn ðə ˈmɪd.naɪt ˌɔɪl/

1.
熬夜工作, 开夜车
to work late into the night
:
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I had to burn the midnight oil to finish the report on time.
我不得不熬夜工作以按时完成报告。
•
Students often burn the midnight oil before exams.
学生们在考试前经常熬夜学习。