back shift

noun [C] UK (US swing shift)

Definition

› WORKPLACE, HR a period of work that begins in the afternoon and usually ends before 12 o'clock at night, or the people who work at this time: After that, they worked five weeks on the back shift. The back shift usually went down the mine at about 3 o'clock.

(Definition of back shift noun from the Cambridge Business English Dictionary © Cambridge University Press)