To oversimplify means to make something seem simpler than it really is by leaving out important details or complexity. When you oversimplify a problem, you strip away so much nuance that your explanation becomes misleading or incomplete, giving people a false sense that they understand something complicated.

Imagine trying to explain how a car engine works by saying, “you press the pedal and it goes.” That's oversimplifying. You've left out combustion, pistons, the transmission, and dozens of other crucial parts. Or if someone says, “World War II happened because one person was evil,” they're oversimplifying a complicated historical event that involved economics, treaties, nationalism, and decisions made by millions of people.

Teachers sometimes warn students not to oversimplify when writing essays. A book report that says, “The main character learned to be nice,” probably oversimplifies a story with more interesting themes. Scientists worry about oversimplification too: explaining that “germs make you sick” is useful for young children, but it oversimplifies the complex ways different bacteria, viruses, and immune responses actually work.

The tricky part is finding the right balance. Sometimes you need to simplify to help someone understand, but oversimplifying can actually make things harder to understand correctly.