'On'および'Upon'を使用した句動詞 - アクションの実行（時）

to have confidence that someone will fulfill one's wishes or requests

to depend on something for a particular outcome

to make a brief reference to a particular topic in the course of discussing something broader

to make a choice or reach a conclusion after careful consideration

to take advantage of someone's feelings, fears, or weaknesses

to dedicate time and effort to produce or fix something

to encounter someone or something unexpectedly

to encounter suddenly or unexpectedly

to suddenly have a great idea