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sleeper

Definition:
1. A rester who is sleeping.
2. A spy or saboteur or terrorist planted in an enemy country who lives there as a law-abiding citizen until activated by a prearranged signal.
3. An unexpected achiever of success.
4. One of the cross braces that support the rails on a railway track.
5. A passenger car that has berths for sleeping.
6. A piece of furniture that can be opened up into a bed.

Use 'sleeper' in a sentence: