Sleeper | Mean of sleeper in English Dictionary

/ˈsliːpɚ/

• Noun
• a person who sleeps in a particular way
1. a light sleeper [=someone who does not sleep well and wakes up easily]
2. a heavy sleeper [=someone who sleeps well and does not wake up easily]
3. a sound sleeper
• someone who is asleep
1. Sleepers were awakened by the sound of a loud crash.
• a place or piece of furniture that can be used for sleeping
1. the sleeper cab of a truck
2. Our guests will use the sleeper sofa. [=a sofa that folds out to form a bed]

• someone or something that suddenly becomes successful in a way that was not expected
1. He may turn out to be the sleeper in this year's election.
2. The movie was the summer's sleeper.
3. The movie became the sleeper hit of the summer.
• a spy who lives and works for a long time like an ordinary person among the people he or she is spying on
1. a sleeper agent
2. The police discovered a sleeper cell [=a small organized group of spies] that had been operating in the city for years.
• a piece of clothing that covers the entire body including usually the feet and that is worn by a baby or small child
• one of the heavy beams to which the rails of a railway are attached