∙ 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 railroad sleeping car.
∙ Something that achieves unexpected success after an interval of time.
∙ A goby-like bottom-feeding freshwater fish of the family Odontobutidae.
∙ A nurse shark (family taxlink|Ginglymostomatidae|family|noshow=1|ver=161011}}).
∙ A type of pajama for a person, especially a child, that covers the whole body, including the feet.
∙ An automobile which, not too quick out of the factory, 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. slang
∙ A sedative. slang
∙ A small starter earring.
Noun
∙ A railroad tie.
The short wooden bars are sleepers, and the long metal bars are rails. rail transport, Britain
∙ A structural beam in a floor running perpendicular to both the joists beneath and floorboards above. carpentry
∙ A heavy floor timber in a ship's bottom. nautical
Watch example usage of "sleeper"
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