noun, noun which may take the genitive case particle 'no'
at the time of an accident; in the event of an accident
Used in formal or official contexts to refer to the moment an accident occurs or the situation of an accident happening. Often appears in compound phrases like 事故時対応 (accident response).
事故時の対応マニュアルを確認してください。
Please check the response manual for the time of an accident.
事故時に備えて保険に加入する。
I take out insurance in case of an accident.
緊急時 means 'in an emergency' and is broader; 事故時 is limited to accident situations.
Compound of 事故 (accident) and 時 (time, occasion). The reading じこじ follows standard on'yomi.