Night and day
Definition 1 of 3
Pro Tip 1/2Frequency Intensity
Indicates something happens very often or is vastly improved, suggesting a complete turnaround in a situation.
Since studying regularly, his grades have improved night and day.
Pro Tip 2/2Not Literal
Used metaphorically to emphasize dramatic change or persistence, not to describe actual time of day.
Her mood swings are night and day, you never know what to expect.
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