没日没夜 méi rì méi yè

DEFINITIONS

  1. day and night
  2. regardless of the time of day or night

CHARACTERS

没 méi
HSK 1
not, have not, none; drown, sink
日 rì
HSK 2
sun; day; daytime
没 méi
HSK 1
not, have not, none; drown, sink
夜 yè
HSK 5
night, dark; in night; by night