Burn the midnight oil

/bɜ:n ðə mɪdnɑɪt ɔɪl/ UK
/bɜ:rn ðə mɪdnɑɪt ɔɪl/ US

Meaning: To work or study until late at night.
تا دیر وقت کار کردن، تا بوق سگ کار کردن، دود چراغ خوردن، شب بیدار ماندن

Example: I have a big exam tomorrow, so I’ll be burning the midnight oil tonight.
example: It is very very hard assignment, and I had to burn the midnight oil to get it completed on time.2
example: Chris is asleep after burning the midnight oil trying to finish his article.
example: I was burning the midnight oil yesterday night to finish this.
example: He burned the midnight oil last night.