noun
- a person who sleeps
- a railroad car with beds for passengers to sleep in
- something that achieves unexpected success after initially receiving little attention
Usage: informal
Examples
- The baby is a heavy sleeper and rarely wakes up during the night.
- We booked a sleeper train from New York to Chicago.
- The low-budget film turned out to be a sleeper hit at the box office.
- The carpenter installed sleepers to support the new floor.
- Intelligence agencies worry about sleeper agents in foreign countries.
- She’s such a light sleeper that any noise wakes her up.
- The sleeper was more comfortable than flying overnight.