空は一面にくもった。

sky; the heavens

topic marker particle; indicates contrast with another option (stated or unstated); adds emphasis

one; best; first; foremost; beginning; start; bottom string (on a shamisen, etc.)

face; mask; face guard; (in kendo) striking the head; surface (esp. a geometrical surface); page; aspect; facet; side; chamfer; counter for broad, flat objects, levels or stages, e.g. in a video game

at (place, time); in; on; during; to (direction, state); toward; into; for (purpose); because of (reason); for; with; by; from; as (i.e. in the role of); per; in; for; a (e.g. "once a month"); and; in addition to; if; although

to get cloudy; to cloud over; to become overcast; to cloud up; to fog up; to mist up; to become dim; to be gloomy; to be clouded (expression); to be downcast; to look slightly downward (of a noh mask; indicating sadness, grief, etc.)