Definition
This idiom is used to describe a situation where an excess of people involved in a task hinders its progress and leads to a poor outcome.
The project had potential at first, but after too many people got involved, the result was a mess; too many cooks spoil the broth.
They had trouble trying to design the new website because too many departments wanted to have their say, it was a case of too many cooks spoil the broth.
The kitchen was crowded with chefs all trying to take charge, and dinner turned into a mess; too many cooks spoil the broth.