parrot
To repeat someone’s words without really understanding them.
To parrot something means to repeat what someone else said without really understanding it or thinking about it yourself. When you parrot your older sister's opinion about a movie you haven't seen, you're just echoing her words. When a student parrots back facts from a textbook during a test without grasping what they mean, that's parroting too.
While real parrots can learn to say dozens of words or phrases, they don't understand what the words mean; they're just copying sounds they've heard. That's why we use the bird's name to describe mindless repetition in people.
Parroting isn't the same as quoting someone or sharing an idea you genuinely agree with. The key difference is the lack of understanding or personal thought. If you explain why you agree with your sister's movie review and add your own observations, you're not parroting. But if you just repeat “It was totally boring and the acting was terrible” without knowing anything about the film, you're parroting her judgment.
Teachers can usually tell when students are parroting information versus truly comprehending it. Real learning means being able to explain ideas in your own words and apply them to new situations.