Question

go on about - He went on about how things were much harder when he was a child.  - Oh will you stop going on about it! I told you I was sorry and there's nothing more I can say.

Accepted Answer

to talk about something for so long (or again and again) that it becomes boring to the listener

Phrasal Verb	go on about
Definition	to talk about something for so long (or again and again) that it becomes boring to the listener
Examples	- He went on about how things were much harder when he was a child. - Oh will you stop going on about it! I told you I was sorry and there's nothing more I can say.

I Talk Long Boring Listener Things Harder Child