Keys lost.
Meaning: This phrase means that the keys cannot be found and are missing. It's like saying, The keys are missing and cannot be located.
Choice of Words: Keys is a noun that refers to a small piece of metal used to lock or unlock doors, cars, etc. Lost is an adjective that means unable to be found, misplaced, or missing. When you put them together, "Keys lost" is a short phrase that expresses that the keys cannot be found.
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