come to think of it

Adverb

idiomatic

(idiomatic) by the way; now that I think about it; indicates something brought to mind.

Japanese Meaning

そういえば / 考えてみれば / ふと思い出してみると

I was about to leave, but come to think of it, I should check whether I locked the back door.

出かけようとしていたけれど、そういえば裏口の鍵をかけたかどうか確認したほうがいい。

Sense（1）

(idiomatic) by the way; now that I think about it; indicates something brought to mind.

Come to think of it, it's curious that nobody was there.