Home › Words › S › slipfaceslipfaceslipface means the lee face of a sand dune where the surface is at the angle of repose for sand (33–35°).Among words judged in Lexicurio's Arena, slipface ranks #2,613 of 42,762 for Qualifying.EtymologyFrom slip + face.nounThe lee face of a sand dune where the surface is at the angle of repose for sand (33–35°).Definitions & examples from Wiktionary (CC BY-SA 3.0).