fall over yourself to do something

fall over (oneself) to (do something)

To expend an inordinate amount of energy or effort to do something, especially as a means of gaining attention or approval. John is such a brownnoser, falling over himself to impress the teacher. My parents fell over themselves trying to seem cool to me and my friends. It was pretty embarrassing, to be honest.
See also: fall, over

fall ˈover yourself to do something

(informal) do everything you can for somebody because you want to please and impress them: After he became manager, people were suddenly falling over themselves to help him.
See also: fall, over, something