Here's why:
* Verb + Preposition: It combines a verb ("spend") with a preposition ("the night").
* Meaning: The combination creates a new meaning that is distinct from the individual words. "To spend the night" means to stay somewhere overnight.
* Usage: It acts as a single unit grammatically and can be used in various contexts, such as "I'm going to spend the night at my friend's house" or "We spent the night camping by the lake."
Let me know if you have any more questions!