What does "keep [someone]'s head down" mean? Could you please tell me some examples?

Native speaker’s answer
Rebecca
When you "keep your head down" you're trying not to be noticed. This is usually so you don't get in trouble or when a difficult situation arises and you don't want to be involved. Ex: The boss was very mean at my last job. I kept my head down so I wouldn't get in trouble. Ex: You're going to be new in the school! Keep your head down and study hard. Ex: Keep your head down. I don't think he saw you. Keep walking!