noun
firmament, azure, the heavens, atmosphere, the blue*, welkin, empyrean; see also air 1, heaven 1.
without warning, suddenly, abruptly; see quickly 1, soon 1.
without restraint, without limit, excessively, inordinately; see unlimited.
See sky in Webster's New World Roget's A-Z Thesaurus II
The celestial regions as seen from the earth:
To rise abruptly and precipitously:
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