noun
low atmospheric pressure; low-pressure system; depression; cyclone
Meteorological term for a region where atmospheric pressure is lower than surrounding areas, often associated with cloudy or stormy weather.
See also: 高気圧
明日は低気圧が近づくので、雨が降るでしょう。
A low-pressure system is approaching tomorrow, so it will probably rain.
低気圧の影響で、頭痛がする人もいる。
Some people get headaches due to low atmospheric pressure.
noun
bad mood; foul temper; tense atmosphere
Colloquial figurative use, likening a person's mood or a social situation to low atmospheric pressure. Often used in phrases like 低気圧な人 or 低気圧な雰囲気.
今日は上司が低気圧で、話しかけにくい。
The boss is in a foul mood today, so it's hard to approach him.
会議室は低気圧な雰囲気だった。
There was a tense atmosphere in the meeting room.