Vocab InfoUnclassified Noun寝(ね)バックprone bone (sexual position)DetailsExamples寝バックprone bone (sexual position)DetailsExamplesDictionary DefinitionNoun1. prone bone (sexual position)SlangAll Forms寝バック 【ねバック】DetailsAudioPlayExamplesThere are no sentences available for this contentHold tight, context sentences are coming soon!Self-Study SentencesStudy your own way!Add sentences and study them alongside Bunpro sentences.Try Bunpro