earthfallEtymologyFrom earth + fall. Cognate with Old Frisian irthfal, erthfel, erdfal, German Erdfall (“a sinkhole”), Danish jordfald, Swedish jordfall, Icelandic jarðfall. Compare waterfall.earthfall means A landslide. Lexicurio rates it Sui generis — a strength score of 88 out of 100.nounA landslide.