非常時

(1)an unstable situation of extreme danger or difficulty; "they went bankrupt during the economic crisis"

(2)非常に危険あるいは困難な、不安定な状態

(3)a sudden unforeseen crisis (usually involving danger) that requires immediate action; "he never knew what to do in an emergency"

(4)突然の思いがけない危機（通例危険を伴う）で緊急な行動をとる必要があること

(1)