一いっ転てん機き

also: いちてんき

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Meanings

1

Refers to a decisive moment or event that changes the course of a situation, similar to 転機 but with a slightly more formal or literary feel.

あの出で来き事ごとが彼かれの人じん生せいの一いっ転てん機きとなった。
That event became a turning point in his life.
この発はっ見けんは科か学がく史しの一いっ転てん機きと言いえる。
This discovery can be called a turning point in the history of science.