Grammar Info
N2 Lesson 4: 7/18

lead to, as a good opportunity to, as a result of, as a trigger

Noun + 契機 + (1)
Verb + (2) + 契機 + (1)

(1) にして、として
(2) こと
Register Formal
使用域 硬い
を契機(けいき)に is a grammar construction made up of を, the noun 契機(けいき) ‘chance’ or ‘trigger’ and に. It is a formal pattern that is used to indicate some sort of trigger and may be translated ‘(A) led to (B)’, ‘as an opportunity to (A), (B)’, or ‘as a result of (A), (B)’. (A) may either be a positive or negative event, but will usually be something extremely big in terms of life, or current/historical events in the world.
を契機(けいき)に will be seen after nouns, or verbs that have been nominalized with either の or こと.
  • 子供(こども)が生(う)まれたのを契機(けいき)に、パチンコをやめることに決(き)めた。
    I decided to quit pachinko as a result of my child being born.
  • 移動(いどう)制限(せいげん)が緩和(かんわ)されたことを契機(けいき)に、観光客(かんこうきゃく)の数(かず)が増(ふ)えた。
    The travel restriction being eased led to an increase of tourists.
  • 彼女(かのじょ)は出産(しゅっさん)を契機(けいき)に、会社(かいしゃ)を辞(や)めた。
    She quit her job as a result of giving birth.
Alternatively, にして or として may replace に without any change in the overall meaning.
  • 田中(たなか)さんは入院(にゅういん)を契機(けいき)にして、タバコを止(や)めました。
    Tanaka-san being hospitalized led him to quit smoking.
  • 大統領(だいとうりょう)の暗殺(あんさつ)を契機(けいき)として、戦争(せんそう)が始(はじ)まった。
    The assassination of the president led to a war.
Caution - Unlike をきっかけに, を契機(けいき)に will almost exclusively be used in relation to some turning point or critical juncture. Due to this, it can sound quite unnatural when used to express a trigger that would not be considered a big event.
  • 先輩(せんぱい)が楽(たの)しそうに料理(りょうり)をしている姿(すがた)を見(み)たのをきっかけに、私(わたし)も料理(りょうり)を始(はじ)めることにした。
    Seeing my senpai enjoy cooking led me to start cooking too. (Natural Japanese)
  • 先輩(せんぱい)が楽(たの)しそうに料理(りょうり)をしている姿(すがた)を見(み)たの を契機(けいき)に、私(わたし)も料理(りょうり)を始(はじ)めることにした。
    Seeing my senpai enjoy cooking led me to start cooking too. (Unnatural Japanese)
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"Sakoku" was the Japanese policy of cutting off any cultural exchange with foreign countries. The arrival of the black ships led to the end of "Sakoku".
Sputnik was launched in 1957. As a result of the launch, the space race began.
A new innovation in technology suddenly happened with the transistor being developed for the first time as a trigger.

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