Etymology

cosleep

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Today it means: To sleep in the same bed (with someone), especially of a family member, parent, child, etc. Full definition →

First used 20th c.
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The story

From co- + sleep.

First known use, by meaning

  • from 20th c. To sleep in the same bed (with someone), especially of a family member, parent, child, etc.

Etymology from Wiktionary, CC BY-SA 4.0.