a sudden change in the state of things resulting in a conclusion or resolution: all at once, all of a sudden

change all of a sudden, happen all at once

innocent, simple / unsophisticated, artless

innocence / unsophistication, naïveté

bartender

emergency vehicle lighting, flashing light, flashing beacon (emergency vehicle lighting)

天変地異: an extraordinary natural occurrence: a catastrophe, a calamity

Kyūjitai form of 転注: (linguistics) figurative extension of meaning

起承転結: structure of a narrative or poem

a carrying pole, a yoke as used by people for carrying things