night and day

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day and night

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

night and day

1. All the time; continuously. I've been studying night and day to get ready for this test.
2. Describing a contrast between two completely different things, often one that has resulted in improvement. Often preceded by "like." Her transformation has really been night and day. She doesn't even look like the same person. A: "Have you seen any improvement in his behavior?" B: "Oh, it's like night and day. He's been a model student this month."
See also: and, night

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

day and night

see under night and day.
See also: and, night

night and day

Also day and night. Continually, without stopping. This phrase is used either literally, as in The alarm is on night and day, or hyperbolically, as in We were working day and night on these drawings. Shakespeare put it by night and day in The Comedy of Errors (4:2): "Time comes stealing on by night and day."
See also: and, night