저기압이 · 저기압을
low (atmospheric) pressure
Example
저기압이 다가오면서 오늘 밤부터 비가 내리겠습니다.
Rain is expected from tonight as a low-pressure system approaches.
Word parts
저 low+기 air+압 pressure
Literally 'low air pressure'.
Good to know
Casual slang: 저기압이다 means someone is in a gloomy or bad mood.
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