disagree over (an idea)

The word "disagree" means to have different or opposite opinions. You use the word "over" to tell what topic the disagreement is about. What follows "over" can be a topic:

We often disagree over politics.

Or it can be a longer noun phrase:

Martha and Paul have always disagreed over where they first met.

You can also hear "disagree about" sometimes, which is a little more casual.

This phrase appears in these lessons: