on second thought

Prepositional phrase

US idiomatic

(US, idiomatic) After reconsidering; on further consideration.

Japanese Meaning

再考の末に / 考え直して / 改めて考えると

I was going to skip the meeting, but on second thought I'll join to support the team.

最初は会議を欠席するつもりでしたが、考え直してチームをサポートするために参加することにします。

Sense（1）

(US, idiomatic) After reconsidering; on further consideration.

I originally thought that it was a good idea, but on second thought I'm not so sure.