noun-modifying (irregular)
Used prenominally to describe a situation, need, or danger that requires immediate attention. Often found in formal or written contexts.
Due to urgent circumstances, the meeting was postponed.
An imminent danger is approaching.
From 急迫 (きゅうはく, 'urgency, imminence') + した, the past/prenominal form of する. 急迫 is a Sino-Japanese compound of 急 ('urgent') and 迫 ('press, approach').