adverb taking the 'to' particle, taru-adjective
Archaic literary word meaning 'suddenly' or 'abruptly'; used as a taru-adjective or adverb with と. Modern Japanese prefers 突然 or 急に.
See also: 突然
古典では「遽然として事が起こる」のように使われる。
In classical texts, it is used like 'things happen suddenly'.