say it: SLEE-poh-vur
sleepover is a noun meaning "an occasion of spending a night away from home or having a guest spend the night in your home (especially as a party for children)". It carries one recorded sense.
an occasion of spending a night away from home or having a guest spend the night in your home (especially as a party for children)
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for sleepover come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.