graveyard : Idioms & Phrases
graveyard shift
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noun the work shift during the night (as midnight to 8 a.m.)
night shift.
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noun workers who work during the night (as midnight to 8 a.m.)
night shift.
WordNet
graveyard watch
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noun a watch during the night (as from midnight to 8 a.m.)
midwatch; middle watch; night watch.