twilight sleep

noun
twi·​light sleep | \ ˈtwī-ˌlīt- How to pronounce twilight sleep (audio) \

Medical Definition of twilight sleep

: a state in which awareness of pain is dulled and memory of pain is dimmed or effaced and which is produced by hypodermic injection of morphine and scopolamine and used especially formerly chiefly in childbirth

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to reflect, repel, echo, or resound

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