Patience is key.
Meaning: This phrase means that being patient is important in order to achieve something. It's like saying, Don't rush, being patient will help you succeed.
Choice of Words: Patience is a noun that refers to the ability to wait calmly for something to happen. Is is a linking verb that connects the subject and predicate of a sentence. Key is a noun that refers to a device used to unlock something. When you put them together, "Patience is key" is a phrase used to emphasize the importance of being patient in order to achieve something.
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