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A phrase used to describe a stark difference between two things. Similar to night and day, but "day and night" implies things got worse whereas "night and day" implies things got better. Sometimes preceded by "like."
JJ Redick was the man back in college, but now that he's in the NBA, he seems content to be a bench warmer averaging 4 points a game. The difference in his performance has been day and night.

Jake: "Wow bro, it was really light out here around 3 in the afternoon, but now that it's 9:00, it's dark as hell."
Blake: "For real dude. The difference in darkness level is like day and night."
by Nicholas D March 15, 2009
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Feb 26 Word of the Day
Commonly used in text messages or social media as a short form for Very Sound Advice.
Mate 1: Hey, I'd be careful risking all that money on one bet. Only risk what you can afford to lose.
Mate 2: Thanks. VSA
by Sexucator February 08, 2021
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2
The beginning and end of the day.
" First, there's day, when it's light, and night, when it's dark, equals: Day and Night."
by XCallXYouXLaterX June 28, 2009
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