dilnu -dil- gismu

x1 is a cloud/mass of clouds of material x2 in air mass x3 at floor/base elevation x4.

See also carvi, tcima.

In notes:

x1 rains/showers/[precipitates] to x2 from x3; x1 is precipitation [not limited to 'rain'].
x1 is weather at place/region x2; (adjective:) x1 is meteorological.
x1 is a nebula of material x2
x1 is a quantity of fluff of composition/structure/characterization/substance x2; x1 is fluffy/airy/soft/fuzzy in texture
ca'o'a (exp!)
Contraction of ca'o co'a. Expresses that the event is progressively beginning.
x1 is a cloud.
x1 is a specific kind of bad weather characterized by large dark rain clouds that block out most of the daylight, large, cold rain drops and an overall dark, uncomfortable and unsettling atmosphere, optionally accompanied by icy wind, such that a change in the weather conditions would be a relief to anyone present, both physically and emotionally.