Nice day.
Meaning: This means a pleasant or agreeable period of time between sunrise and sunset. It's like saying, Today is a very enjoyable day.
Choice of Words: Nice is an adjective that describes something as pleasant or agreeable. Day is a noun that means the period of time between sunrise and sunset. When you put them together, "Nice day" is a description of a pleasant or agreeable period of time between sunrise and sunset.
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Related Expressions