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sleepover

American  
[sleep-oh-ver] / ˈslipˌoʊ vər /

noun

  1. an instance of sleeping over, as at another person's house.

  2. a person who sleeps over.

sleepover British  
/ ˈsliːpˌəʊvə /

noun

  1. informal an instance of spending the night at someone else's home

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Etymology

Origin of sleepover

First recorded in 1970–75; noun use of verb phrase sleep over

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.