simple past tense and past participle of sleeper

(usually in combination) Relating to railway sleepers.

Someone who sleeps. / 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.

(rare) To mark a calf by cutting its ear.

(rail transport, Britain) A railroad tie. / (carpentry) A structural beam in a floor running perpendicular to both the joists beneath and floorboards above.

plural of sleeper

A surname.

plural of Sleeper

present participle of sleeper

A group of people (sleepers) who inconspicuously remain dormant in a community until activated, by a prearranged signal, to perform acts of espionage, sabotage, and/or terrorism.