For water, an earthquake (actor -um- & inst) to cause a section of a mountain, bank, cliff face, stone wall (theme -on) to slide, as described above.
Actor is often a third person pronoun -na, signalling an unknown actor.
Lennahna nan duntug ad ugga.
The mountain slid last night, (lit. It caused the mountain to slide...)
Also common is a passive form without an actor.
Nalnah nan tempeng Maddug ti agguy nihamad.
What Maddug stone walled slid because it was not solid.
Used as a substitute word for goday, see Appendix 26, Lexical Substitution