名案が浮かんだ

I came up with a great idea

→ 名案
phrase Rare #38,792
I came up with a great idea Literally, “a brilliant idea came to me.” The subject is often omitted, so the phrase commonly means that the speaker suddenly thought of a great idea.
JA: 帰り道に、名案が浮かんだ。
EN: I came up with a great idea on the way home.

名案が浮かんだんだよ

I've come up with a brilliant idea.

その時名案が浮かんだ

That’s when I came up with a brilliant idea.

名案が浮かんだ

I've come up with a great idea.