sleeper.
Someone who sleeps.
Meaning & usage
Someone who sleeps.
I'm a light sleeper: I get woken up by the smallest of sounds.
She's a heavy sleeper: it takes a lot to wake her up.
That which lies dormant, as a law.
A spy, saboteur, or terrorist who lives unobtrusively in a community until activated by a prearranged signal; may be part of a sleeper cell.
A small starter earring, worn to prevent a piercing from closing.
A railway sleeping car.
We spent a night on an uncomfortable sleeper between Athens and Vienna.
A sleeper hold.
Something 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.
Any member of the family Odontobutidae of goby-like bottom-feeding freshwater fish.
A nurse shark (family Ginglymostomatidae).
A 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.
An 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.
A sedative.
A bet placed on the gambling table and then forgotten about by the gambler.
A pod or similar device containing a person in cryosleep.
Where this word comes from
From Middle English sleper, equivalent to sleep + -er.
To mark a calf by cutting its ear.
Where this word comes from
From Middle English sleper, equivalent to sleep + -er.
A railroad tie.
A structural beam in a floor running perpendicular to both the joists beneath and floorboards above.
A heavy floor timber in a ship's bottom.
The lowest, or bottom, tier of casks.
Where this word comes from
Compare Norwegian sleip (“a sleeper (a timber); as adjective, slippery, smooth”). See slape.
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Definitions, grammatical labels, IPA, etymology and examples: Wiktionary contributors, extracted by Kaikki / Wiktextract. Adapted under CC BY-SA 4.0. Selected fields and authored examples are shown; third-party quotations and audio are omitted. See contributor history.
Last enriched 2026-09-10. Definitions are in English. Romanizations are shown when supplied by the source; syllable estimates are omitted for unsupported scripts.