What it means
を契機に means “using something as an opportunity” or “prompted by something.” It presents an event, change, or experience as the trigger for a subsequent development, decision, or action. The noun before を契機に is usually a significant event rather than an ordinary situation, and the expression is common in formal speech and writing.
Usage note
を契機に is relatively formal and is especially common in reports, essays, and announcements. For a more general or conversational expression meaning “taking something as an opportunity,” をきっかけに is often more natural.
How to use it
制度の変更を契機に、会社は研修制度を見直しました。
Prompted by the change in the system, the company reviewed its training program.
制度の変更を契機に、会社は研修制度を見直した。
Prompted by the change in the system, the company reviewed its training program.