Definition of swing shift noun from the Oxford Advanced Learner's Dictionary

 

swing shift

 noun
noun
BrE
 
; NAmE
 
(North American English, informal)
 
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the shift (= period of time worked each day) from 3 or 4 o’clock in the afternoon until 11 or 12 at night; the workers who work this shift
See the Oxford Advanced American Dictionary entry: swing shift