Almost exclusively used in the phrase 焦眉の急 (しょうびのきゅう), meaning a matter of great urgency or an imminent crisis. The standalone noun use is rare.
Measures against climate change are a matter of great urgency.
This problem requires immediate attention.
urgent need; pressing necessity; matter of extreme urgency
From Chinese 焦眉 (jiāoméi), literally 'scorched eyebrows', referring to a fire so close it singes one's eyebrows, hence an imminent danger or urgent matter.