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Douglas Harper's Etymology Dictionary
swing-shift

1941 (typically 4 p.m. to midnight), from the notion of "facing both ways" between day and night shifts; see swing (v.) + shift (n.).

Usage examples of "swing-shift".

The swing-shift caretaker, Jessica McGivney, had already started getting the pajama-clad toddlers ready to leave, rousing them from bed and helping them into slippers and robes.