Definition of sleep tight
: to sleep deeply and well
- Good night. Sleep tight.
sleep tight
idiom
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Word by Word Definitions
sleep
play
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: the natural periodic suspension of consciousness during which the powers of the body are restored — compare REM sleep, slow-wave sleep
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: a state resembling sleep: such as
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: a state of torpid inactivity
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: to rest in a state of sleep
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: to be in a state (as of quiescence or death) resembling sleep
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: to have sexual relations
See the full definition of sleep
tight
play
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: having elements close together
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: so close in structure as to prevent passage or escape (as of liquid, gas, or light) — compare lightproof, watertight
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: fitting very close to the body
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: fast, tightly, firmly
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: in a sound manner : soundly
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