空が一面に曇ってきた。

sky; the heavens

indicates sentence subject (occasionally object); indicates possessive (esp. in literary expressions); but; however; still; and

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 mumble; to mutter