back shift
noun[C]
UKukus(USswing shift)WORKPLACE,HR
aperiodofworkthatbeginsin theafternoonand usuallyendsbefore 12 o'clock atnight, or thepeoplewhoworkat thistime:
After that, theyworkedfiveweekson the backshift.
The backshiftusually went down the mine at about 3 o'clock.