noun, noun which may take the genitive case particle 'no'
low altitude; low sky
Refers to a low altitude or the sky near the ground. Often used attributively with の to modify nouns like 飛行 (flight) or 雲 (clouds).
The airplane is flying at a low altitude.
Low clouds are hiding the mountain top.
low-altitude flying; flying at low altitude · barely scraping by; consistently poor results; on the verge of failing
Compound of 低 (low) and 空 (sky). The reading ていくう is the standard on'yomi combination.