To perpetuate something means to cause it to continue or last, often indefinitely. When you perpetuate an idea, a tradition, or even a problem, you keep it going through your actions.

A family might perpetuate a tradition of gathering for Sunday dinners, passing the custom from grandparents to parents to children. Libraries perpetuate knowledge by preserving books for future generations. Scientists perpetuate important research by training new researchers to continue their work.

The word often appears when discussing how behaviors or beliefs get passed along. When older students tease younger ones, and those younger students grow up to do the same thing, they perpetuate a cycle of bullying. False rumors can be perpetuated when people repeat them without checking whether they're true.

Notice that perpetuate is neutral: you can perpetuate good things or bad things. A community garden perpetuates the joy of growing food together. A misunderstanding perpetuates itself when nobody bothers to clear it up. The key idea is continuation: whatever is being perpetuated keeps going, often because someone's actions, whether intentional or not, give it new life.