nounπShareSomeone who sleeps."My little brother is a very deep sleeper. "personhumanChat with AIVocabulary GamePractice Reading
nounπShareThat which lies dormant, as a law."The new student's quiet demeanor made her a sleeper in the debate club; her powerful arguments weren't apparent until the later rounds. "politicslawgovernmentChat with AIVocabulary GamePractice Reading
nounπShareA spy, saboteur, or terrorist who lives unobtrusively in a community until activated by a prearranged signal; may be part of a sleeper cell."For years, the friendly neighbor was just Mr. Henderson, but after receiving a coded message, he was revealed to be a sleeper activated to disrupt the city's power grid. "politicsmilitarypersonwargrouporganizationactionpolicegovernmentnationChat with AIVocabulary GamePractice Reading
nounπShareA small starter earring, worn to prevent a piercing from closing."My daughter lost her earring, so she wore a sleeper to keep her piercing open. "appearancewearbodyitemChat with AIVocabulary GamePractice Reading
nounπShareA railway sleeping car."We spent a night on an uncomfortable sleeper between Athens and Vienna."vehicleChat with AIVocabulary GamePractice Reading
nounπShareA sleeper hold."The wrestler used a sleeper hold to subdue his opponent. "sportactionbodymedicineChat with AIVocabulary GamePractice Reading
nounπShareSomething that achieves unexpected success after an interval of time."A box-office bomb when it first came out, the film was a sleeper, becoming much more popular decades after being released."achievementbusinessoutcomeChat with AIVocabulary GamePractice Reading
nounπShareA goby-like bottom-feeding freshwater fish of the family Odontobutidae."The aquarium keeper carefully added a small sleeper fish to the community tank. "fishanimalChat with AIVocabulary GamePractice Reading
nounπShareA nurse shark (family Ginglymostomatidae)."The marine biologist studied the sleeper shark in the aquarium. "fishanimalChat with AIVocabulary GamePractice Reading
nounπShareA type of pajama for a person, especially a child, that covers the whole body, including the feet."Aaron, Devin, and Laura looked so comfy in their sleepers."wearitemfamilyhumanChat with AIVocabulary GamePractice Reading
nounπShareAn automobile which has been internally modified to excess, while retaining a mostly stock appearance in order to fool opponents in a drag race, or to avoid the attention of the police."The sleek, black car was a sleeper; it looked like a normal family sedan, but under the hood was a powerful engine. "vehicleracepolicetechnologysportmachineChat with AIVocabulary GamePractice Reading
nounπShareA sedative."The doctor prescribed a sleeper to help Mrs. Jones sleep through the night. "medicineChat with AIVocabulary GamePractice Reading
verbπShareTo mark a calf by cutting its ear."The rancher decided to sleeper the newly born calf so he could easily identify it later. "animalagriculturemarkChat with AIVocabulary GamePractice Reading
nounπShareA railroad tie."The train rumbled loudly as it passed over each sleeper beneath the tracks. "materialbuildingstructuretechnicalChat with AIVocabulary GamePractice Reading
nounπShareA structural beam in a floor running perpendicular to both the joists beneath and floorboards above."The construction worker carefully positioned the sleeper on the joists before attaching the floorboards. "architecturebuildingstructurematerialChat with AIVocabulary GamePractice Reading
nounπShareA heavy floor timber in a ship's bottom."The shipwright carefully inspected each sleeper in the hull to ensure the ship's structural integrity. "nauticalpartmaterialbuildingChat with AIVocabulary GamePractice Reading
nounπShareThe lowest, or bottom, tier of casks."The warehouse workers carefully checked the sleeper, ensuring the stack of barrels wouldn't collapse. "nauticalstructureChat with AIVocabulary GamePractice Reading