go on for (a length of time) about (a topic)

One of the meanings of "go on" is to continue talking about something. For example, if someone stops talking and you want to encourage them to say more about a topic, you say:

Go on.

When you use "go on for ___" or "go on about ___", it expresses that someone is talking for too long. For example, in the sentence:

She went on and on about her dog.

...it's clear that the speaker didn't want to hear about the subject's dog.

You can use "go on for ___ about ___" to communicate both the length of time and the topic, or you can use "for" or "about" by themselves:

She went on for 15 minutes after you left.

Every time I talk to him, he goes on about why I need to move back out to Arizona.

This phrase appears in these lessons: