Alone time.
Meaning: This means that someone wants to spend time by themselves. It's like saying, I want to be by myself for a while.
Choice of Words: Alone is an adjective that means to be by oneself or to have no one else present. Time is a noun that means the period during which something happens. When you put them together, "Alone time" is a way to express that someone wants to spend time by themselves.
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Related Expressions