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sleeping car a railroad car that is equipped with sleeping accommodations.
sleeping pill a pill or tablet containing a drug that induces sleep.
sleeping sickness a usu. fatal infectious disease found in tropical Africa, characterized by fever, weakness, and tremors, and transmitted by tsetse flies. [2 definitions]
sleepless passed without sleep. [2 definitions]
sleep mode a power-saving mode of operation to which a computer or other machine reverts when idle, in which power to the display and to other nonessential parts of operation is deactivated.
sleep tight to sleep well or soundly.
sleepwalking the act of walking around during sleep; somnambulism.
sleepwear clothes worn in bed; nightclothes.
sleepy needing or tending to sleep; drowsy. [2 definitions]
sleepyhead (informal) someone who is sleepy.
sleet freezing rain. [2 definitions]
sleeve the part of a shirt, dress, or the like that covers the arm partly or completely. [3 definitions]
sleeveless combined form of sleeve.
sleigh a light horse-drawn cart on runners that is used to carry people over snow and ice. [2 definitions]
sleight cleverness, as in deception; deftness.
sleight of hand skill with one's hands in confusing or deceiving onlookers, as in juggling or magic tricks; legerdemain.
slender of a person, attractively slim. [4 definitions]
slenderize to make, or cause to appear, slenderer. [2 definitions]
slept past tense and past participle of sleep.
sleuth a detective. [2 definitions]
sleuthhound a dog that detects tracks by smell; bloodhound.