焚膏继晷焚膏繼晷

fén gāo jì guǐ

Meaning

to burn the midnight oil (idiom); to work continuously night and day

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Characters

焚fénto burn林火膏gāogrease, fat; ointment, paste高⺼继jìto continue, to carry on; to succeed, to inherit纟米晷guǐthe sun's shadow; sundial; time日咎