プログレッシブ和英中辞典(第4版)の解説
けいき【契機】
an opportunity; a chance
これを契機として心を改めなさい
Take this opportunity to reform.
新校舎ができたのを契機にクラブ活動が盛んになった
With the construction of the new school building, the students became more involved in club activities.
病気になったのを契機に酒もたばこもやめた
On falling ill, he gave up both drinking and smoking.