day and night

day and night

All the time; continuously. I've been working day and night to make sure that everything is perfect when your mom comes to visit.
See also: and, night
Farlex Dictionary of Idioms.

day and night

 and night and day
all the time; around the clock. The nurse was at her bedside day and night. The house is guarded night and day.
See also: and, night
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs.

day and night

see under night and day.
See also: and, night
The American Heritage® Dictionary of Idioms by Christine Ammer.
See also:
  • day or night
  • I was up all night with a sick friend
  • the still of (the) night
  • the still of the night
  • at night
  • a night on the tiles
  • tile
  • have a gas
  • the morning after
  • the morning after (the night before)