burn the midnight oil
US /bɜːrn ðə ˈmɪd.naɪt ˌɔɪl/
UK /bɜːrn ðə ˈmɪd.naɪt ˌɔɪl/
1.
to work late into the night
:
•
I had to burn the midnight oil to finish the report on time.
•
Students often burn the midnight oil before exams.
to work late into the night